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it would run better than the current 13 macbook pros at least
should be pretty playable
 
I'm running wow on a current macbook and it was running great until the 10.6.7 patch came out. I'd say if you could run it using 10.6.6 you should see about 30fps at the good to better setting. make sure your running 4 gigs and not the stock 2 though.
 
im talking GPU (vs hd 3000)
processor isnt everything

Great, the GPU is also better!

https://forums.macrumors.com/threads/1102927/

Even if it wasn't, it wouldn't be any worse, as that would be ridiculously stupid of Apple and, to my knowledge, they've never come out with a computer that had a less capable GPU than the previous model (though they have come out with computers that had a GPU only marginally more capable). Provided the two GPUs were very close, the i5 is going to make the difference.

Do your research first. I know the CPU isn't everything, but it's a bigger step up than the GPU, which is why I mentioned it.
 
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