Reunion Movies, which exist only to reunite main characters from good Movies so they can try to recapture the lightning that has long left the bottle, are almost always destined to fail. This is so for the same reason that your high school reunion sucked, and the
Facts of Life reunion show wasn't quite what you were hoping it would be.
But rules are made to be broken, and
The Hangover: Part II is made to break rules. I won't bother ...