Wet noodliest?..... I suppose for dmg it might be spriest, hpriest, fury warrior, mw monk, all shams, and afflock. I honestly haven't played each one to test.
For stupidest?..... Ret, feral, ww, and maybe arms. Really though I'd say only certain abilities of these are "stupid", Sword of the Light, Ferocious Bite, Fists of Fury, and maybe Execute.
I think most classes have a use under certain circumstances. I actually get more pissed seeing so many of the OP classes all the time.
"stupid", Sword of the Light