Actually, it does run, I've played it on my macbook. But dn't expect good performance!
- runs slow on EVERY map. especially when lots is going on. the very first level (Crew expendable) is HELL when you're outside in the rain. the only way to make it run (a little) faster is to look at the sky or at the ground.
- it looks horrible (compared to the same game on, say, an iMac)
- lag during cutscenes and ingame (although i've experienced that on the iMac too, but of course less long/bad).
and just FORGET multiplayer. or expect to die A LOT. I have the game on both my macbook and iMac, and playing on the same server I ended up with negative score on macbook and positive score on iMac... solely because it runs slow. don't even bother playing games with more than 5 players.
Running it in windowed mode helps a little for performance, but that's SP only again...
The only reason i installed it was to play through LAN with my friends, which is ok, but not great of course.