Possible? Certainly
Enjoyable? Subjective
Easy to pwn with?? More so then warriors probably as the resource is renewed by time or effects instead of how much you hit or get hit by something else. Honestly I think it will be like boxing paladins ... but with more damage potential. Actually in all truth if my accounts make it to being qualified when the expansion hits running 1 pally and 4 deathknights sounds interesting....