Borderlands 1 was a really fun game. Borderlands 2 took it to an entirely new level with tons of new concepts and incredibly funny DLCs. I spent about 90 hours on BL2 but in the end, the constant gratuitous killing got to me. i mean, in my hundreds upon hundreds of PSO hours, it was easy to shoot down Dimenians and Canadines without end because they are dehumanized enemies but in BL2, when you get a quest with one single objective: to shoot the face off of a guy named Face McShooty, a suicidal maniac, I kind of drift away.
So yeah, in my opinion, with a smidge less murdering, BL2 would have been perfect.