Surprisingly funny. The jokes are subtly written so the comedy just catches you off guard. Nothing seems forced. The chemistry and charisma of the leads, along with the supporting cast, make this movie enjoyable on many levels. It's not the best movie that mankind ever made and I'm not saying that. It's just a cool, unique, and funny movie so just watch it. Look, it's not going to be for everybody and that's cool but it's way better than what passes for comedy these days.
It's over the top if you're going to sit back and analyze it but that's not what this movie is for. You'll see slightly adult humor that's a little more mature than what you'd see in the "average" action comedy.
Look, just watch it. I don't want to over hype it but I know that this is the type of movie that gets bad reviews from guys that just want to see a bunch of physical humor and fart jokes. This is better than that.