There were some moments in this movie that were totally hilarious. Farrell's use of physical comedy and facial expression were amazing. But then he goes and ruins it with silly, over-the-top, cheap shots that any 11 year old boy could make up in the locker room. Wahlberg was pretty weak, but much of the supporting cast was awesome. Even the story line wasn't bad, pretty good for a low brow humor flick...
Shame, because it could've been a great movie, but it left you feeling like they came up with about 10 really good jokes, got lazy, and just used lowest common denominator humor to fill the rest.
All in all, it's not worth the $10+. It's a renter.