I love enhance PvP though I'm no pro
-Use Ghost Wolves as a healing CD
-Frozen Power(Talent) is your best friend when a melee dps hits his CD's (Keep away from them! used unleash elements to make that gap even further)
-90% of the time we have to use our malestrom proc for an instant healing surge
-Most enh shamans dont use healing stream, the heal it does adds up so use it
-Don't forget Capacitor, or stormlash totem
-Give windshear an easy to hit keybind, I think it has the shortest CD for an interrupt in game so make use of that fact
-Purge everything
-Spirit walk breaks snare (which is getting a buff next patch
)
-I usually tie ancestral guidance and ascendance together to make the most of the 40% heal
I find that when I kite a melee when he uses his CD's I have much better odds, it seems cheap but most of the time we have no other option unless we want to die
Enhance is really fun to play but I dont see many around, whether we are good as a class or not mostly comes down to the player. We are also primary targets in most situations so heading in head first is usually a bad idea.