Like the shock crystals at the beginning of Borderlands 1, I have found a few I really hate in BL2.
First up is Claptraps Birthday Bash. Just because it makes me hate everyone in sanctuary for dissing Claptrap on his friggin birthday. Sure, he's annoying, but that's a MASSIVE dick move, to leave him alone on his BIRTHDAY, especially when it's literally right around the corner.
Any missions you hate, and why? --- GT/PSN: DEGALON Official Fuu of the Naruto Storm 3 Boards
Both of the fights against Piston. Holy God I HATE that guy. At the blimp fight in UVHM (the first time I had ever played the Torgue DLC), I was bombed to death literally five seconds after the cutscene. In the fight with the Badassasaurus, I died a bunch of times, and several of those were when I wasn't even in the arena. I had just respawned and I was already downed... --- "NOOOOO!!! How will I juggle?!"