Fantastic review from IGN you posted there, can't have put it any better myself.
First film was great, and if you loved it too, I strongly recommend you keep it's good memory by not going to see this crock-of-**** of a sequence.
Completely forgettable and really not that funny if you seen the first one. It just doesn't have the ingenuity or originality of the first Hangover film, which is ultimately what made that film funny.
Seriously, don't bother with this **** people. You know film makers are desperate when they start relying soulely on shock value and random visual comedy for laughs - a smoking monkey, Shaolin monks hitting them with sticks, stereotypical Arab villianisation and "chicks with dicks" if your still immature enough to find their existance funny, is the best you'll get.