I can't speak for the MBP.. but I have it installed on my 13" MBA Ultimate and it runs fine.. at medium settings I'm getting 30fps in SW.. lower the settings and I'm pushing 40.
Haven't tried it in a raid environment yet, but I think it'll be just fine.
Air. I play WoW on my Air just fine, just don't expect ultra settings obviously. You can play on the default "Good" settings just fine with the Air (I use Good presets but up the view distance to high and have no issues).