will it run on a macbook? Answer is yes.
I think the real question your asking is "Do you guys think ill be happy with the gaming experience if I play wow on a macbook?"
And that is dependant on the person. I play on a computer (pc.... yeah i know) that averages 80 fps, everything set high at 1280x1024, in **** during peak time. But during the times when im lvling a new job, i use my wifes laptop (very mid-end current model hp) to keep my 70 rouge with me just in case of alli problems and... if i had to play full time on the hp, i would be very very disappointed.
On the flip side, my wifes love playing on her laptop, and doesn't really care about the degrade in performance so long as she doesn't lag out during raids.
So, in short, your going to have to just try it out and see if it fits your personal preference.