I am not sure about Greenberg.  It appears that the studio is selling Ben Stiller and Noah Baumbach the director more so than the story.

I like all the people related to the makingof this film, but I don’t think I could watch 1.5 hours of Greenberg, the character.  The man that Ben Stiller is playing isn’t someone I’d be interested in knowing.  Who wants to watch someone be unhappy?