Borderlands 
Left 4 Dead 2 Multiplayer Comparison Borderlands coop gameplay is simple, but for some reason, I just love playing it with friends. L4D2 is fun too and also simple in its own way, but it's definitely not a relaxing game.
L4D2 requires a lot of focus to make sure you don't disturb a witch or set off a car alarm or are just generally aware of where your teammates are. Borderlands plays more like an MMORPG, so you're questing most of the time and can semi relax while you play. What that means is you can actually chat with your friends on a headset about whatever you like while you play. It actually feels like you're playing a fun game with friends instead of some game where you and your friends dish out orders to one another. It just isn't nearly as enjoyable. When you're playing L4D2, your friend becomes just another player because of the way you have to play the game.
Kind of a weird comparison, but this really matters for me. If I'm on a headset chatting with friends, it's kinda nice to be able to relax and talk to them about whatever you like instead of stressing out about the game. I guess it's kinda like having a friendly conversation with a friend while disarming a bomb: it just isn't fun.
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Though maybe it's cause I don't have a headset and there just isn't nearly as many people playing Borderlands on PC. I've been told that Borderlands is pretty much a first person post-apocalyptic Diablo 2, and that makes sense.
If you get a good group of people in l4d then the game goes by usually without a hitch. The fact hat the group of players know what they're doing and how to do it effectively makes the game so much more enjoyable.