I can tell you that it definitely does not. I've been on the Windows client for about a week now and it feels like a final product except for some more pending balance changes. The mac client feels like beta software. My mouse is jerky, the graphics look different (worse) and the performance is nowhere near as good as the Windows client. I hate to partition my drive for a game, so I'll just wait it out for them to fix up the Mac client a bit more.
The problem is when you partion it for just one software, you are losing a lot of disk space and you are unable to use it in mac osx because of bloody ntfs ****.
Hope blizzard tweaks the game for mac users.