You'll see my group make-up/specs in my sig. I like my specs for ease of use. May not be the best for individual use (mage would be arcane or fire, lock would have more points in destro if not full destro), but the rotation is easy: sick pets on target (felguard, water elemental) spam frostbolt/shadowbolt and pick your favorite spammable elemental shaman rotation. Priest single target heals tank and if things get hairy just spams the heck out of AE heals. Not as synergized as the tank/shamanx4 but not far off.

I've enjoyed the team for PvE. I really don't use targeted AE's and don't feel like I've missed out because of it. There is some gear competition between my three cloth classes and the Shaman ends up competiting for caster cloth gear sometimes as well. That said, the group is very fun/powerful/flexible. Can't imagine not have totems, portals, healthstones, summons, soulstones, food/water, nearly every buff, AE healing, .....

Also, it does allow for a fair bit of mix/match if you are in a guild. My guild is sort of imploding atm so that benefit isn't doing much for me right now.