You've already seen this film.

So I guess they were thinking if it ain't broke don't fix it with this sequel? This film didn't even require a new script just some minor edits to the first one. Basically what we have here is classic lazy filmmaking, and a blatant quick cash grab to capitalize on the success of the first film. Shame on you Todd Phillips. If you're gonna make the same film you could of at least made sure it was as funny as the first. It's like they're twin sisters but not identical. One is hot while the other although similar in appearance is actually butt ugly! I really hope they tried a little harder with the third and hopefully final film.

It appears the scriptwriters have had the same alcohol/drug induced amnesia as the film’s characters and just rewritten the first movie. After sobering up they realised their mistake and in a desperate attempt to differentiate it from the original they’ve removed all the jokes.

Even this sentence is too much attention given to this film's spectacularly failed attempt at comedy.

Two years after the bachelor party in Las Vegas, Phil, Stu, Alan, and Doug jet to Thailand for Stu's wedding. Stu's plan for a subdued pre-wedding brunch, however, goes seriously awry.

-All rights go to IMDB

This didn't play any better the 2nd time around than it did the first. The gags are occasionally funny but most of the humor seems a bit recycled and forced.

I still find this funnier than the first (I'm not a fan of the first at all). Its a meaner, sweatier, nastier movie which feels like the film Philips wanted to make first time round. Don't get me wrong, it's not all that great but it did more to make me laugh.

This may be heightened by the presence of a monkey though.

What happens in Bangkok, stays in Bangkok. Well I haven't really heard anybody say that about Bangkok yet, but I suppose the same applies as it does with Vegas. Ladyboys. Monks. Geoff having a long shit even though a sign clearly states "no snakes in the toilet please".

This was predictable. It was predictable that this would be predictable. They overdo it one night, outlandish things happen, and they wake up with amnesia. I wonder what will occur in part III. Its only redemption would be if Geoff appears in it and does a nice hot poo on somebody's windscreen by hanging his arse out of the back of a convertible while bombing it down the motorway.

Clearly the criticisms launched at this movie are completely true, it not only lives on the shadow of the first one, it tries as much as possible to remind you of it and follows the exact same structure, but in the end I had fun, I laughed a lot and really I didn't expect more from it.

Has some laughs but suffers from "Been there, done that" syndrome. If the drug dealing monkey wasn't in the movie, I wouldn't have even liked it.

If it's pretty much exactly the same movie, why is it about a quarter as funny?

It's bad enough for a sequel to just be a complete rehash of the first film - to just be the exact same story in a new location. But to then be inferior in every possible way? This may be the laziest (though bafflingly successful) cash grab in film history.
I thought the first movie was very funny, though it has been overpraised a bit as more than it is. But this film? I only laughed at a couple jokes in the entire movie. It's not even worth any further review, except to say this: Zach Galifianakis' fame clock is at 14 minutes and counting with his tired shtick