What do Moonkins bring to a raid group?

A variety of synergy aspects. 5% crit to the raid, that isn’t proc based (like Elemental Oath), 13% damage increase via Earth and Moon**, Innervate for a healer if the moonkin him/herself doesn’t need it, OoC rez to make wipe recovery faster, Improved Moonkin Aura is a 3% haste buff to the raid (provided they are in range), 3% spell hit, if specd into Imp FF, and still one of the best dances .

**Please note, that this increase is just 13% more damage to all schools. Curse of Elements from a warlock untalented is less damage increase, but has passive spell penetration that will reduce resistances to bosses. Unholy Death Knights should have Ebon Plaguebringer, which is equal damage increase and also increases damage to diseases. None of these stack, so if your DK gets his Ebon Plague off before you get E&M, his buff will be the one that shows. Please note, even of E&M isn’t on the boss, you will still get the 3% increased spell damage personal benefit.