I caught this film last night. It's a lot like RUSHMORE, and in fact, for the first hour, I thought it was a lot better than that film. However, it collapses under bad writing in the third act.
The acting was good, particularly newcomers Anton Yelchin and Kat Dennings. Robert Downey Jr. is always worth watching, but he was full of cliches here. I'll be very surprised if this film does well at the box office.