I had never heard of that movie before, but I decided to rent it anyway because it was full of well-known actors like Vince Vaughn, Vincent D'Onofrio, Benjamin Bratt, Keanu Reeves and Tilda Swinton.
I was a pretty entertaining movie. In short, it is a 17 years old guy who still sucks on his thumb and tries to stop in order to have a better social life. I like the character of the little brother, and I think that everyone played characters different than what they would usually do. I recommend it.
http://imdb.com/title/tt0318761/