I loved this movie and it's definitely one that I'll watch again. The premise could have been tricky to handle, and in lesser hands, the film could have been an amusing but forgettable diversion. But director John Hamburg shows his skill by doing an outstanding job making everything work, turning a clever concept into a truly excellent movie. The film is solidly cast throughout, with no weak links, and in fact, there are so many talented actors/actresses that even the minor roles are memorable and funny. While nobody does any scene-stealing, Jon Favreau comes close, with sarcastic mutterings that almost serve like a Greek chorus of cynicism.
As for the main characters, Paul Rudd finally gets a film that capitalizes on his considerable talents as a comedian and a serious actor. The awkward Klaven-isms he delivers throughout the movie had me laughing non-stop. Jason Segel also does an amazing job, treading a fine line between an insensitive buffoon and a good-hearted, perceptive friend. Rashida Jones is witty and believable, leaving no doubt that in spite of his various shortcomings, she loves Peter Klaven. The entire cast is more like an ensemble than a group of supporting characters, and the result is that the movie flows in a very natural way.
The Blu-Ray comes with a generous set of special features, and it's there that you realize the strength of the director. There are some really funny deleted and extended scenes, and it must have been hard to edit them down, but Hamburg wisely decided to exercise great restraint in order to keep the film moving along at a brisk pace. Far too often, comedies over-reach by letting scenes run longer than necessary. It's totally understandable, but Hamburg made the right choice. Besides the deleted and extended scenes, the extras include a gag real, a "making of" featurette, commentary, and more. It's one of the few discs where I've actually watched all the extras.
The Blu-Ray transfer has very good picture quality and a decent audio track. Highly recommended.