Can you guys recommend some good CO-OP online games?

Borderlands 2. Played a way out too but it wasnt that long. I love coop games but there arent that many

I'd recommend Rainbow Six Siege. It's not exactly co-op though

You can nab Game Pass Ultimate for 3 months for just $1 (at the time of writing), So for a few bucks you could play Crackdown 3 in co-op. Is only about 15gb to install and has relatively low system requirements for a modern title.

Brawl Stars, Stardew Valley, Clash Royale. 50charsfffff

call of duty is the best game out rn and whoever said it not is a fortnite fan boy

garrys mod, minecraft, csgo
amazing classic games that have endless hours to replayability

If you haven't tried Counter-Strike: Global Offensive, just try it now.

I strongly recomend Warframe, is a really good game and is also focused on co-operative mechanics

Payday and Terraria. Those two games are really fun to play with a friend. I would recommend.

Dead Space 3
Borderlands (The Pre-Sequel)
Dungeon Defenders 2