Well Demon Hunter is the class I've put the most time into I've had a lvl 13 since last week that I continue to play and I've leveled a couple more to get rare drops off of the skeleton king. As far as resource management goes, I don't really have a problem with it outside of the cost of a few abilities. Of course that's with a level cap of 13 so who knows how that translates into end game. Vault is a good example of a discipline ability that needs to cost less. You can only use 3 vaults back to back before your discipline is depleted. Add in that the ability can get hung on small obstacles, etc. and you can see the issue.
I do agree that the abilities themselves need a different roll out order. It seems to me that by level 13 all classes except for the Demon Hunter can absolutely annihilate a large pack of mobs. The Demon Hunter gets it done for sure, but not quite like the others. I think rolling out multishot earlier would probably remedy this, but until you try it out, who knows.
In theory I like the idea of two independent resources, but I'm betting in the end they will go with a single resource like the other classes do. Since demon hunters often come from villages and towns ransacked by demons who have slayed their loved ones, I think Revenge would be a nice resource.