I thought the first one was funny, but a bit forced. This review will be short because the second film is a carbon copy of the first except in Thailand instead of Vegas. Also the language is a bit cruder and the film is a bit raunchier with the inclusion of some Thai ladyboys.
I guess they're going to have a third one, but I'm not sure what's left to do unless Alan gets married.
I recommend this movie because it has some funny parts, especially the pictures shown during the credits, but it isn't something you need to rush out and see.