My brother and I saw a screening for this last night and we could not stop laughing. The beginning song sets the movie up perfectly and it's just a roller coaster from there. It did get a little vulgar and in the middle of the movie it shows a threesome which everyone in the theater literally out loud went "whoa...what?". I think they could have done without that. But the rest of the movie was amazing. Quotable, funny, and a cameo appearance of another actor made everyone in the theater give a round of applause.
Definitely a "check your brains" at the door movie...but it's going to be hard finding another comedy to beat Channing Tatum and Jonah Hill.