I've done almost all 25 man testing on beta as a mage, and yeah, our damage sucks in comparison to most classes (single target). Frost seems to be on top in beta. Fire if you use molten armor you go oom very quickly unless you plan on spamming free scorch when you're oom which is a terrible idea, you can sacrifice dps and use mage armor (which i've been doing and have absolutely no mana problems), Arcane also has mana problems and dps output is quite low. I enjoy playing fire the most, and fights that require AoE it is very nice. Our stats drop tremendously at level 85, i have around 17% crit and 500 haste. So very few hot-streaks as fire, ect. Who knows what blizzard has in store for mages when this goes live, hopefully we get a slight boost