[Dredging memory fields…]
BL1 - Badass Bruisers with friggin’ Rocket launchers, especially when in close quarters (like Circles of Slaughter).
BL2 - Threshers, when they gang up on you, otherwise pretty much rabid anything.
TPS - Torks, I guess, though they are more annoying than hated. I am not sure I have any top-of-the-list ones for TPS.
BL3 - Aside form the main villains, I presume? I hate Tinks on general principle because a) GBX changed the name from Midget for PC purposes (which is absurd for a gaming franchise that made fun of everyone and everything up until then), b) they gave the midg-, sorry, “Tinks” voices, trying to make them sound all badass I guess, and c) they used what sounds like a Tink voice saying, “Geeeear Boooox” in some sort of pathetic attempt at sounding both tough and cutesy at the same time in place of the original guttural, primal, Psycho, in-your-face scream as the GBX logo announcement (and they even retconned the other games’ logo announcements as well). Sorry, rant over. I suppose for BL3, I really hate all of the Anointed enemies (especially the stupid badass tink version that shrinks and grows, etc.)