Agreed… whenever I see a slag-infused enemy I have a “sigh/meh” feeling come over me as I feel obligated to take him out first. 
Freaking rabid stalkers and bullyrots especially in uvhm
Unskippable cut scenes.
Scooter : " if your here to kill me you should probably know , you’ll never take me alive you robotic son ofa bitch "
Whaaaaat?!
Me 
Without hesitation rabid stalkers.
Surveyors can be a pain too, especially when you have no long/medium range gun.
EXPLOSIONS!!! is the answer. I noticed that some weapons such as the Swordsplosion knockback and make Skeleton Mages unable to go invisible and teleport, allowing you to make short work of them. ^^
I don’t think there is anything more annoying than surveyors or seeker/laser spamming constructors.
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Rabid Stalkers. Rabid skags are easy enough to just circle-kite. Stalkers? RIP bruh. Also single best reason to own a Florentine.
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Skeleton Mages. If you don’t have much else going on, they’re easy enough to deal with. But you ALWAYS have a lot going on when they show up.
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Gravediggers. Seems they shed slag (or resist it), and their stoopit ranged corrosive thingamabobs have knockback. That’s the worst.
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The Hyperion turrets going up Thousand Cuts. OP8 have TOO much health regen, and it’ll take forever to take 'em out without a Bee (and the Bee is a crutch outside of raid bosses). Seriously. Maya, OP8 with on-level corrosive Pimpernel, should NOT need 20 - 30 rounds to take out a single wall turret.
Surveyors don’t bug me as much, but I’ve only done the Peak with Axton and Maya so far; either has a good answer to surveyors. Easy way to keep then occupied is just damage their pals on the ground. Surveyors won’t attack while they’re shielding or repairing, and they sit relatively still.
Or just Phaselock the buggers.
Other stalkers than rabids? Too little health to be an issue. They depend too much on their shields, and they’re easy to crit. Therefore the rabids are like the Dodge Ram of stalkers- OVERCOMPENSATING.
<3
I know right!? I never made this connection until I went through there in UVHM as Gaige! Wow, they really take care of them! Although I usually finish them off with a Twister to the face/general area I manage to hit once those projectiles move.
Tiny Tina…I cant stand it!!!
Or Rabid(creatures) / Cursed Pirates
ion loaders
Pestilent Stalkers…
Beasts aren’t really a problem for me as I enjoy keeping a spike shield around for those areas. But Rabid Stalkers they have really high health and can kill you right as they die so you might not get a second wind