Lifetime? RuneScape (oldschool, none of the rs3 stuff)

Within the last 5 or so years? Insurgency (mainly Sandstorm) Hits the perfect blend of realistic shooter with fast paced action. I also exclusively play coop where you’re on a team with other real people and you’re playing against a team of bots. Nice and easy-going. You aren’t getting all pissed off and mad at someone on the other team and the modded servers are really fun