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I can also attest to this. I quit wow in patch 3.
but I downloaded it again and created a trial account to check out the major changes in patch 4.

I was shocked at how bad it ran
I have a 2-3 year old iMac, but it used to run wow on high settings no problem. I had to turn everything to low to make it run smooth, even in non-congested areas.

Can't say I will return to wow, and actually looking at D3 PVP now.

Edit: and noooooooo, I was not streaming game files. I downloaded the whole thing.
 
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