Eh, on the subject against Enh against Healers or Hunters;
If you have water shield up through the fight, you won't die against a hunter, ever. The fact that he's even attacking you, means you won't die. Only a hunter that has a moth and can execute fluid controlled burst has a chance at taking out a skilled Enhancement Shaman (actually, any shaman that spams Healing Surge), but even the Lockout could be trinketed (Or does trinket only work for blanket silences and not spell lockouts?) or Juked.
An Enhancement Shaman will 1v1 a priest every time. No question about it. He will just completely out sustain the priest, which doesn't have the proper CC (blanket silences and spell lockouts) to combat any specced Shaman's sustain.
An Enhancement Shaman can only kill a druid, if the druid drops out of travel form to keep applying rejuv, the second the druid starts chain morphing to keep rejuv up, the Enhancement Shaman will always be guaranteed to catch up with him and secure a kill (Easy solution is to just try to outrun him, if you heal, you'll lose the fight.).
Paladins are easy because once they blow HoJ and Bubble it's all down hill from there. Even if it is a full mail (high armor) Holy paladin, which is pretty rare on it's own, given the better Int choices in the other armor sub-classes, Enhancement does primarily spell damage and wind shear at >35% will win the fight, because most Holy Paladins only start healing when they get low because they've been too busy spamming Denounce. Morphv is a perfect example of this. I kill him all the time on my enhancement shaman because his damage is always higher than his heals by at least 200%. Denounce spamming will always lose the fight.
The only healers Enhancement has trouble with are Restoration Shamans, for obvious reasons. And even then it's a close fight. Their primary healing spell can be purged, but they do have a solid spell lock-out which cripples Enhancement Shaman's sustain when used at the proper times.
These are all just my opinions based on my experience. At no point should the be considered factual by me or anyone else, therefore they aren't worth flaming over.