Depends why you're playing it and what you're willing to put up with. I basically only support/heal in ORPGS and MMORPGs, so I'm willing to put up with a lot, but I just feel like a fool when I try to heal in Cataclysm.
You'd have to see for yourself. They won't kill an entire archetype, but it's not even remotely healthy at the moment, for my tastes.
I appreciate some parts of it, the playstyle of the new model is great, especially for Druids, but the numbers are really fucked. In PvE you feel so piss weak and in PvP you ARE piss weak. On what planet is it engaging design to make damage scale higher than healing while you OOM in no time flat if you ever lay off your efficient heal? Why is it a good idea to give every DPS these massive, passive heals that scale off of a percentage of their health? If you heal, you can seriously go into a BG, be the only healer, and come up fourth in healing.
I mean for all of this OOMing, they could at least modernize drinking and not have you on your ass resting after every fight.
I think if they saw this as, imo, as big of a problem as it is, that they'd have made some moves to fix it already so it's just easier for me to throw up my hands and say fuck it. All I ever do is heal anyway, 2004-2010. I need a vacation.