Well i'm most likely going Bear Shaman.
PvE wise i cant give you much information since i'v only had one Day at lvl 20 and i was more concentrated on fending off the gankers
On a PvP level i'd say they are decent.. the thing is.. dont even try to heal yoruself during a 1 vs 1 battle (Not at that level anyway, i cant comment on later levels) and concentrate on combos (+ the heal proc activation).
A rather nice Class and the only Cimmerian "caster" type, thats why i'm picking it.