I'm actually relatively tolerant of fan-favorite characters. Every character has good points that while you might not enjoy, somebody else would, and most of the time my dislike for characters stem from their irrational fanboy/girl communities more than the actual character (I'm looking at you, Namor and Storm fanpersons).
I guess the closest I would come to would be Wally West. I get that he's supposed to have surpassed his mentor and mastered the Speed Force - but the level of his power is a little ludicrous. Short of celestial beings like Presence/Specter and maybe 5th Dimensional imps, he's basically the most powerful superhuman in the pre-52 DCU. I don't know, it irritates me a little.
Still, even then, I don't actually mind Wally West as a character.