recommend a class for grouping and raids

[Daywolf]

Shammy is fine. If you are just wanting to try something else, and if you like group healing, I'd say Cleric.

[DMN]

The thing about shaman is they are fairly late bloomer-ish.

Their real hallmark is the slow line. But in many case, for many levels, in grouping situations slowing just isn't worth the mana. Like compound interest, though, it just keeps getting better with levels, then finally slowing will be very mana efficient for the amount of damage it offsets.

Enchanters and clerics will probably find groups more easily because they offer things no one else can reasonably do, and shaman can be replaced and damage difference of having slowed enemies made up in numerous ways.

You don't need many enchanters in raid situations, nor shamans. leaving cleric really. If i could put you in a time machine I'd tell ya to go cleric. But you have already invested a decent amount of time in your character. That said, If you don't enjoy playing your shaman right now, I'd say reroll a cleric. But be aware, clerics can be awfully boring, And even in clerics case they need until their 30s to really separate themselves from the other priest classes functionally and you will be severely restricted in soloing undead in select, often times over camped places..

[Dinbin]

Gotta think of shaman as "prevention" instead of "cure" in the healing sense. Slows, regens and buffs are all ways to improve DPS and reduce damage taken, which means less reliance on in-combat and post-combat heals. The downside is it's quite mana intensive... keeping your party in chloro/str/agi/haste AND have enough spare mana to toss a heal once in a while can be tricky. But doable, up to a certain level. When it works, however (ie: you strike the mana balance that doesn't require your puller to stop) the xp rolls in faster than with a cleric, because you can increase your groups DPS, which means faster kills, which means more pulls.