I loved this movie, yet I can see why others hated it. This is not the comic food we have grown up on. It is a different cuisine that tastes strange at first, but if given a chance, rewards with fresh, delicious sensations at every bite.
Early in this movie our actor heros take turns mugging an emotion on command. I think this moment is the key to understanding the entire film. Almost every scene is painted by facial expressions and body language. The editing lingers to give us time to enjoy each portrait, then cuts a bit further along in the story than we are used to. This unfamiliar timing gives the strong cast a chance to act rather than react. The story is about actors, but the movie is a tribute to comedic acting.
If you want a formula comedy, rent something else. If you want movie that is funny, warm, original, and brilliant and are willing to give its different pace a chance, put this film at the top of your list and plan to view it twice.
