Furthermore, before any other MMO decided to do so - and most still don't do so - Blizzard decided to even out both factions as far as mechanics go. Alliance got shamans, Horde got paladins. There were still a few small mechanic changes, but MOST of the mechanics were equalized. Compare this with the hilariously massive failure of Warhammer Online.
I find this interesting, Cirno. I don't see Warhammer Online as a failure at all, rather, I enjoy it MORE than WoW in many occasions. Also Warhammer Online has 'different classes' for each faction, but most of the abilities mirror one another fairly closely(except for perhaps the Squigherder/Marauder/White Lion/Shadow Warrior rectangle) at least in my experience.
Could you please elaborate on how you feel Warhammer was a 'hiliariously massive failure'? As I truly do not understand your viewpoint at all. Are you saying that allowing both sides to use the exact same classes made it better?