So I originally ran this game in Parallels and W7, but was unable to get into a Zombie game, which is the entire reason I bought the game in the first place.
I just installed it via Crossover on my i7 iMac and it works. The loading screen has a little halt like it's not going to work, but 'unstalls' and continues. There is a screen that serves as the main menu of the game, and every time I have run it so far, (except the first) that screen is blank (it was there the very first time, just pixelated and half of the letters were missing, but very readable), but after changing the resolution in the settings menu, it works fine. I have only played the zombie maps on this game, and I assume I will finally pick the right resolution where the menu is visible. The Steam Cloud doesn't appear to be working again, so I think I will have to play the campaign over again (it's short) so I can get the other zombie map, so I will report back then.
I did notice a few slowdowns in the gameplay, but not 100% sure this is Crossovers fault, as another player made the comment 'laaaggg' so who knows, I'll report back after more testing, just wanted to let folks know that the game will run.