The show that's responsible for the travesty that is Seth Rogen
The show is great, but I've always disliked Seth Rogen and had no idea how he kept getting hired. He has always been annoying, but on Freaks and Geeks he is SUPER ANNOYING! I see him come on screen and I just want to punch him in the face, especially in the title sequence where his hair is really short. He just looks like a mean, creepy person. And his character on the show (at least for the first half of the series that I've seen so far) is useless, pointless, has no story or anything - I have NO idea what he's even doing there! He just stands there looking like an a-hole and has maybe one line per episode. Busy Phillips has had much more story and screen time, and she wasn't even credited as a lead.
Just think of how much better comedy in Hollywood could've been for the last ten years if Rogen had never been miscast on this show in the first place. He truly is worthless and annoying.
Update: I just watched episode 10 and Rogen wasn't even in it. Not even a walk-on.