Are we talking about who looks/is terrible or who people hate to face?
I thought Barraka was cool in MK2, but in MK9, he looks a bit generic.
I'm beginning to loath playing Raiden players. It's the same thing, and yes, that should make things easier. I played this one guy that just spammed the Hell out of teleport last night. And then it was just sweep or throw or superman or 3,3,4. I know it's all about reaction but when teleport is being spammed like Hell, its a bit hard to react and then either block high, low, jump or poke. I WISH his teleport appeared next to you and not out of sweep range.
I dont think there are bad characters that arent very good. I've faced good Strykers in the past. Hell, if you're semi competant, most of Sheevas combos do over 30% for relatively simple stuff! Two unblockables, unblockable XRay and the best teleport in the game.