Just wanna say, if anyone rocks a Gunzerker, you need a Grog Nozzle (Tiny Tina DLC quest mission weapon, just never hand the quest in) and an Unkempt Harold.
I'm on UVHM right now, which should be nightmare mode. Nothing can touch me and I decimate a level 60 Wilhelm in about two seconds, I'm level 58. Insane build.