Many people don't like Adam Sandler's comedy movies, and of all the ones he's made, this one can be said to be one of the "worst", so to speak. However, the humor in it, seeing this comedy genius play two roles and seeing a cast where even Al Pacino himself acts in a way that no one has seen him act before is very funny.
Good review.
You're right, in this film we see how these actors perform roles that are unique and that perhaps we have not seen before.