Morrowind has mudcrabs...
I vote for no annoying creatures. just challenging ones
Morrowind does indeed have mudcrabs, and also slaughterfish (Like cliffracers except in water, and if you set foot into water, they WILL come.) and greater bonewalkers (Honestly, I think they're worse than cliffracers, because cliffracers can't damage you're strength to the point where you can't even move without dropping all of your equipment.).
And I really didn't think mudcrabs were that bad in Oblivion, what really got to me was will-o'-the-wisps, damage attribute spells combined with being able to become completely invisible except when casting spells or attacking did not make for a pleasant combination.
I also agree, I'd rather no annoying creatures, but that's probably too much to hope for. It seems that developers just can't resist putting some enemy into a game that seems to exist only to annoy players, or maybe they don't try, but it still inevitably happens in a game with as many enemy types as an Elder Scrolls game is likely to have, I guess it's hard to ensure every foe you face is fun to fight if you have so many to work with. But reduce the amount of different enemy types, and it gets repetitive because you're always fighting the same enemies, and repetition is one of the factors that is likely to create annoying enemies, so either way, there's going to be some sort of annoying foe, but what kind it will be only playing the game will tell.