I don't play WoW, but maybe we have different games in our collections. I don't see ANY difference between performance or graphics in OS X & Windows versions of games like "Rome: TW", all "Age of Empires" games, besides a good few more. Granted they're much older games, but it's still a valid benchmark.
IMO, not unreasonable to expect Apple with all their finances & resources these days to be much more proactive in dealing with these issues.
Well no, not really. The games may well be running 15% slower than their Windows versions, they're just old enough to run faster than your ability to tell the difference.