The druid relies on beeing mobil while the priest have SOOO manny tools to counter damage but i would say that its hard to play it to its fullest while controlling 4 hunters.

Shamans are great:

Tremor totem and agility+strength totem (they will merge in WOTLK)

Shamans get Hex in WOTLK wich kinda is like sheep just that:

-The target is able to move??? (read it somewere)
-45 sec Cooldown
-Its a curse and can be decursed but not dispelled (Resto shamans gets decurse in WOTLK aswell)

The shamans chain heal is nice when all your hunters are hugged up and spirit link seems well enough for a 41 talent in WOTLK.