I'm still only at level 29 with my team (no raf ...) - but so far its all good. Team consist of:
- tank: pally
- healer: priest
- dps: mage, shaman, druid
This gives an impressive amount of buffs and utility (rezz, portals, water/food, remove poison/magic/disease/curse etc) 8) - a good tradeoff for the extra complexity (imo).
However ... with the next patch the change "mana spring totem and healing stream totem will be combined", 4 shamans looks pretty inviting - if they still stack ...