So, I've seen a tone of forums lately with people complaining about Borderlands 2 not having dismemberment because I wasn't seeing any myself so I thought I'd see if others had the same issue. Though there are chunks of bandit meat flying out when I get a critical hit with my sniper all the limbs remain intact. I saw some screenshots on these forums of people who had dismemberment working all fine and it appeared that they had PhysX off, so I turned it down to low and the next minute I had midgets with no limbs. Turned it on again and no dismemberment... I myself would prefer to have PhysX on high with no dismemberment because PhysX in this game is stunning. But if you REALLY want dismemberment, put PhysX down to low. I hope this gets fixed soon though, cause I want both!
UPDATE: Alright, I don't know how I didn't think of this before, but I haven't updated my drivers in a few months, that obviously includes PhysX drivers. Intalled 306.23 and bam, PhysX AND dismemberment. UPDATE YOUR DRIVERS PEOPLE.