I watched this with fairly low expectations. I'd heard the major complaints: that it was too long, too indulgent, that the central premise--funny man as tragic figure--didn't really work. All of that was pretty much true, and I think it was Judd Apatow's weakest film of the three he's made but that said I still liked it a lot. It was very funny in places, especially any scene that involved Seth Rogen's character with his two housemates, Jason Schwartzman and Jonah Hill. All the acting was terrific. Having just seen Rogen in Observe and Report, it was compelling to see him play someone entirely different. He was sweet and nerdy in this movie, and despite the endless stream of dick jokes, he kind of played a prude. I also liked the way that Adam Sandler, playing a very successful comedian, never tried to be likable.
I think that Apatow could have cut about twenty minutes from this movie and it would have been a lot better. I also think that if he continues to make movies he should start getting out of his comfort zone. His daughters are adorable but they probably shouldn't be in every movie he makes, and I actually prefer Leslie Mann, his wife, in supporting roles.
Sidenote: Every line that Jonah Hill has ever said makes me laugh.