I bought the first Borderlands (1) for PS3 many years ago; I played through the game solo and on coop at least a dozen times. Then I bought it on Steam sale to play on PC, did the coop for a few more play throughs.

Zombie has given me some grief for the fact that every time he logs in to Steam, I am in BL2. The following article is a great summation of why this game is awesome:

http://www.cracked.com/blog/5-ways-bord ... n-machine/