I had high hopes for melodyne and for some things it does work quite well. However, when things don't go well it doesn't really have the tools to get multiple tracks sorted out. It's also hard to keep multiple tracks in phase with melodyne.
Audiosnap gives you a lot more control over what you want to do with multitracked drums. And you can move the data across all the tracks simultaneously so keeping them in phase is easy.
As a drummer, I also agree with the comment on miking, playing good parts, etc. The better your recording and playing is, the less you have to do. Although I've never seen a drum recording that couldn't be improved with layering Addictive Drums or other good samples.
gabo