Like even if they didn't promise more customizations during SL, the thing is we let A LOT slide under the assumption all races would be brought to the same level in an ongoing process. Mind you, a huge issue is that the level of cosnsitency between races is HIGHLY fluctuating.
You have your Orcs and Night Elves and Humans looking like a million bucks, and then you have Blood Elves and Worgen with the bare minimim, and then you have AR well bellow that.
But there was the tacit understanding on this "ongoing process" so we were all game for waiting, but for them just dropping it and saying "we'll add more when we feel like it" feels really scummy, not even a "for now no more, but we are already working on more concrete stuff for next expansion" or "nothing major this expansion, but we are adding more skin tones, hair colors and eye colors" nothing of the sort.