Snare is OK on MD.
If i have to choose a model for Kick and Snare, i go directly for the AR. because you get really fast what you want. (of course depend of kind of music)
if you need Acoustic Kick and Snare go to MD
if you need Electronic Kick and Snare go to AR
To get electronic sounds on the MD you need to layering for each Drums, so it’s take 2 or 3 machines to get what you want, but it’s possible like demonstrated the excellent Justin Valer :
http://www.valerrecords.com/store/
I think MD is nice for all crazy stuff…
For metal things like ride etc… i go to sample because it’s never sounds natural, and i like metal natural stuff… never the same, included FM.