And from a lore perspective, that's the definition of a Human. FTL also agrees, and I'd assume almost any game with multiple races where only ONE is "Humans" would do the same. Humans are the perfect "base" race.
It might just be over representation due to most notable mage characters being human, but humans seem to be pretty high up there when it comes to being good mages when you take dalaran into consideration as well.
"If you have to believe it on faith, you have no reason to believe it at all.” Aron Ra
The time has come to close this thread. What is the best atm is stated many times over and what is best in the expansion simply isn't known yet as there has been no balancing at all.