Forgetting Sarah Marshall starts really pathetic, I even found it difficult to watch at first. However, it slowly improves. Come the middle of the movie, you won't be able to stop watching it, and by the end you should be very happy you made that choice. There a number of scenes in that scenario that are gems. Their beauty comes from the fact that they take unexpected turn, at least when it comes Hollywood standards. The end is rosy, true, but it's not too syrupy and it's very funny.
Truly worth the pain of the intro.
7*/10