Hangover 2 had it's moments, but I felt lesser ready to laugh at some points because of some of the re-hashed moments from the first movie. Felt very much on a timeline, or on the same screenplay just set in a different city.
Didn't take away from some of the new funny moments, but overall I don't think it was all that great. The first one to me was great. One of those, most of us have been there in certain moments kind of things like a Planes Trains and Automobiles kind of movie.