Loved that RDJ won. His Holmes was a lively take on the iconic character, and I definitely enjoyed his performance the most out of those in that category.
Christoph Waltz and Mo'Nique get more unstoppable each day (not undeservedly; they were both terrific).
On The Hangover, it winning is unusual, but I'd call it legitimate. If you're going to have a "Best Comedy [or musical, but that's a pretty small genre these days]" prize, you should be prepared to recognize one of the dominant forms of comedy. Doing The Hangover well requires just as much art, in its own way, as a highbrow comedy (as proof, just look at how many films do lowbrow comedy wrong).