GTA Online, from Grand Theft Auto V, is the game (mode) I played the most in my lifetime, since 2015 and counting (even playing it rarely these days, I am too rich there) so since Ubisoft brought a similiar mode to Watch Dogs Legion, then after completing Main Campaign and DLC "Bloodline" I went to play Online Mode. It was mostly a CHORE.
Since Ubisoft dropped Watch Dogs Legion after "1.5.6" update I know my opinion literally will not change anything about this game, but I am interested in giving some feedback.

• The world is so much empty to explore, the only collectibles are from Hotspots (Stars, Mask or Tech Points), that are few (10 or so?) and respawn WEEKLY, no daily or hourly respwn fopr different classes of items (ETO, clothing, weapons, vehicles...).
• Mission designs of coop missions are BROKEN by default, unbalanced missions requiring the players to restart from BEGINNING if someone dies or fails the mission? Not even GTA Online had this [censored], and that has some really broken missions (aham, "The Doomsday Scenario"). "Project OMNI" is one of the most broken piece of unbalanced [censored] I ever played, if not for really good players and my personal determination I would never finish them. "Wolfpack Leader" series of missions are just almost as terrible.
• "Events" is only a single type of event (destroy a OP CT Drone that spawns Pursuer and/or Kamikaze - the worst - drones) that only spawn at 2 places, Stockwell War Bunker and Tidis Park that is only really difficult because of the exploding Kamikaze drones and also most Agents are most likely underpowered to fight them (Aiden Pearce, with NEGEV, is by far the best option to bring to this Event).
• I must complain about the travesty that "Aiden's Jacket" is; all you had to do was to copy the model you developed for that cameo at "Bury Your Dead" mission of Aiden's Trenchcoat but your Jacket was a really poor imitation, putting that on Aiden it was so wrong, almost like "mutilating" a piece of himself.
• After finally reaching level 80 there is literally nothing good to do, even because money is barely useful apart from shallow cosmetics, and Tech Points become only obtainable by 2 Daily challenges or those weekly Hotspots, so at this point I can no longer recruit more members to Dedsec.
• Wasted opportunities not to bring more story missions that would complement the main campaign, like developing further Mina Sidhu, showing where Jackson Pierce is, addressing the canon fate of Skye Larsen, addressing if Sabine Brandt really died or not, what ws done to Richard Malik after his arrest...
• For twice I was doing a solo mission in free roam in a public session and 2 idiotic players decided to kick me from session and I lost the progress I was doing!

So on and on, Watch Dogs Legion is so poor of content, while having the issues of main game (buggy, no physics, unoptimized, bland, generic) and worse (terrible lag on missions) it baffles me how pretentions Ubisoft was into putting a separate mode for Online and abandoning it in just 1 year instead of integrating it to main campaign just like Watch Dogs 1 and 2 did so well. Watch Dogs Legion really killed the franchise didn't it? Since the next Season begins next Tuesday I'll check it to see the rewards but if they do not interest me I will just uninstall Watch Dogs Legion, I will not even buy the 500 coins required for me to buy the awesome "Arctic Fox Outfit".

Some feedback to your feedback:

• the world isnt empty,its full of good operators and the hotspots are only once a week for balance that influence that you need to recruit operators and upgrade all your tech
• coop is broken maybe but only when host leaving and there is host migration
• Leader of the Pack is tactical and when you played it more than once even easy,it isnt just run in and activate mission marker as fast as possible
• Project Omni is hardest mission in wdl online,you always should have at least one in team who did it already,communication is important,chat only is enough
• City event,yea isnt that easy but keep in mind,online is made for more than one player and with other operator like g36/fit/berserk one even easy solo doable
• and sabine death,yea maybe they left it open for wd4? same as mina?
• kick from session happens,but its just a solo mission,just do another in other session,not much exp or eto anyway

but with the point that they dropped it too soon i agree,there is so much potential

"Events" is only a single type of event... that is only really difficult because of the exploding Kamikaze drones and also most Agents are most likely underpowered to fight them (Aiden Pearce, with NEGEV, is by far the best option to bring to this Event).

There are lots of agents that work great against Swarm Drones during those events and some of them even more useful than Aiden Pearce.

DJs can boost their own and other players damage using DJ buff. Drone Experts have a homing dive bomb you can throw at Swarm Drone and hide, and then just repeat that several times. A longer approach, but super safe. Beekeepers let's you ignore all Chase Drones during event, because beekeeper's suit has shock invulnerability. Professional hitmen can roll and avoid some hit scan damage. Agents with Albion Vendetta perk will deal more damage to Swarm Drone than Aiden Pearce, because Pearce can't use reload damage boost when using grenade launchers, etc, etc.

But the most important thing, those agents who have Berserker perk (DJs, hitmen can have it, NEGEV Kelleys can have it) could heal from defeated enemies including drones. So you could surround yourself by chase drones you turned off, and when you're low on health just heal from them punching them. Aiden can't do that.

For twice I was doing a solo mission in free roam in a public session and 2 idiotic players decided to kick me from session and I lost the progress I was doing!

You can play solo missions in Friends Only mode. You can cycle through all solo missions: choose one then go to main menu and abandon it, a new one reappears on the same spot. You can reset the location of a solo mission, choose another mission instead, choose the 1st one again, repeat that if you want a specific location. That's a non-issue, really. And as Se7enOne said above, not enough ETO/xp to make a fuss about.

Watch Dogs Legion is so poor of content, while having the issues of main game (buggy, no physics, unoptimized, bland, generic) and worse (terrible lag on missions)

Red Dead Redemption 2 was way more successful than Watch Dogs: Legion, but Rockstar stopped supporting it, what a waste! The point is comparing everything to GTA Online is counter productive and will lead to a disappointment.

Regarding lags, I'm not saying that Legion's net code is perfect (some perks stop working when connection is terrible), but the game isn't that popular, so there are lots of players online who just live too far from one another. Ubisoft can't fix that. Information can't travel faster than speed of light anyway.

it baffles me how pretentions Ubisoft was into putting a separate mode for Online and abandoning it in just 1 year instead of integrating it to main campaign just like Watch Dogs 1 and 2 did so well.

Terrible idea that will ruin the core features of single player experience: deep profiler and NPCs schedules, karma system and permadeath mode. There is another point why I'm really glad that they separated Online from single player: I could edit my single player agents using mods and still play online with my online agents without affecting my own online experience.

Since the next Season begins next Tuesday I'll check it to see the rewards

You can do it right now. There are only 3 seasons on repeat: Rebels, Stripes and Nobles. The next one should be Stripes, you can see Stripes' battle pass in this video:

@KenTWOu You can do it right now. There are only 3 seasons on repeat: Rebels, Stripes and Nobles. The next one should be Stripes, (...):

Thanks for the video, and I also found one for "Nobles" season:

This said, I find those rewards for season "Stripes" awful, the rewards of Nobles are not much better, even though I liked the helms and that plated armor. "Rebels" is clearly the season with the best rewards, I feel lucky for starting playing Online Mode while this season is active, I am absolutely certain I would have dropped Online very soon if any of the other active 2 seasons had been active.
The only thing left for me is buying "Arctic Fox Outfit"; since I have 700 WD Coins, I am not sure yet if I will play this "Stripes" season just enough to earn the remaining 300 WD Coins (grinding until level 42, yuck) or just buying them with real money from Ubisoft in-game store...

You can play solo missions in Friends Only mode. You can cycle through all solo missions: choose one then go to main menu and abandon it, a new one reappears on the same spot. You can reset the location of a solo mission, choose another mission instead, choose the 1st one again, repeat that if you want a specific location. That's a non-issue, really. And as Se7enOne said above, not enough ETO/xp to make a fuss about.

Yeah, I learned soon enough to do solo mission in "Friends Only" session, though I did not know about these nice tips to cycle through locations. But this was a very annoying issue because this was not supposed to happen in first place, and the 2nd time it happened those 2 idiots managed to kick me right when I was almost escaping the restricted area to complete the solo mission. Bringing GTA Online again, it waits until you finish any activity in Free Roam to only then kick you from session.
I understand GTA Online, even with its flaws, is a very high bar to reach, but Ubisoft should have tried harder with Online Mode of Watch Dogs Legion.