Are shamans really useful in groups and raids?

[Grymes]

Hi all

I've played my shaman up to level 32 now, and though I like playing him I can't help but to feel like a buffbot and off-healer in groups.

Rarely do I get to string DD's and stack them DoT's. If I do, there's likely other classes around that would replace and out do my dps.

I see no reason this will change in the late game.

Are we a jack of all trades, yet mediocre at them all?