I wouldn't really recommend playing games like WoW on a Macbook. It's an overall unsatisfying experience because, simply put, this machine wasn't made for graphic intensive games!
My girlfriend uses a MBP to play Wow, but it still gets pretty hot so she puts it on a cooling pad.
But, don't expect too much from a laptop with an integrated video card!
You can generally make a decent tower yourself for gaming for about 1200 bucks or less these days, assuming you just want to play the games decently and not at the highest frame rate.