This movie could've been a lot more than it was. A number of its elements were just so obviously forced.
First off, I have problems with Seth Rogen's character seeming to never stop talking. He does similar things in movies such as Pineapple Express, but it works better over there than in this movie.
Also, halfway through, there's a fight scene between the two main characters that has absolutely no reasoning behind it. It simply wouldn't happen. Then, after this crazy fight, they're suddenly the best of friends again.
I was left with a sense of incompleteness. Not a polished movie. Moderately entertaining, and a few good jokes, but that's all.