6 seconds CD interrupt, and constant purging, those are the things that make enhancement kill healers. Without them, I don't think enhance can kill healers. So asonimie's testing is pretty accruate. In 5 v 5 arena, no way you interrupt the healer's heal if you are not on that healer. You need the burst or healing debuff to kill. I am sure he can kill the single tree druid quicker, if he rotate his interrupt and purge. But that's not realistic in an arena 5 v 5 situation.

Ret paladins has no interrupt, no healing debuff. So obviously it has higher burst. Especially when you open those wings after bubble, not to mention you have stun to keep your target there. Also I think the strength of paladins is the defense. The instant heal + hots x 4 really = a holy paladin currently (not sure after the nerf). So in 5 v 5, you basically have 5 dps and 1 holy paladin healing.

About rogues, I see it working with all CDs intact. What happen after you blow your CDs and kill 1 target. Plus as far as burst go, it seems only combat spec can deal high burst. But the survival is kinda low for them.