Matthew McConnaughey drives me up a freaking wall, he can't act his way out of a paper bag. He played the coach in "We Are Marshall" and he just made him look like a bumbling idiot. It would have pissed me off way more if I cared at all about Marshall University (but it still pisses me off a bit because I think it makes my state look dumb.)
I've grown very tired of Seth Rogan, too. He's a lot like Will Ferrell in that his first couple of movies were funny, but then he kept playing the same character and I just got sick of it.
Natalie Portman pisses me off because she's so inconsistent. Sometimes she's God awful and other times she's great, I never know what I'm going to get when I am watching a movie with her in it.