More movie studios should follow the example set by A Fish Called Wanda, which was followed by Fierce Creatures. It wasn't technically a sequel, but the same four actors got together for another movie. Fierce Creatures wasn't as popular as Wanda, but it was hilarious. I think the Hangover gang could pull that off, although it's probably too risky for the studio.
It's the same idea followed by the Broken Lizard comedy troupe (Super Troopers, Beerfest, etc). Although those movies aren't great money-makers, they make me laugh.
Not to say I won't see it, but I think that they've done enough. Even if they deviate from the plot of the original two movies, I just don't know if it will be enough to entertain me. The second movie was good, but definitely a downgrade due to a lack of originality. I'd hope that the third movie would step that up a lot if it gets made.
#2 was definitely not as good as the first one. They were clever in how they got the characters out there, and there were definitely some funny scenes but it was also a huge disappointment considering how good the first film was.
This movie would have been better without the full frontal nudity in my opinion. I know others will disagree but it was not necessary. (Some women have said that it is about time due to the many years that they have been exposing women???) They could have done more with Zach's character like they did in the first movie.....he turned out to be the hero and not just plain idiotic like they had thought.