First of all, I have the same laptop as OP. 15" 2010 2.66 i7 (1599$ refurb!!! great deal

)
Bootcamp adds a very noticeable boost in framerate. Plus, if you want to overclock your card, you can increase your fps by another ~10fps with minimal temperature increases (YMMV of course). I have some overclocked examples below:
My GTA IV benchmark with all settings on high, shadows very high, and textures medium (for some reason I couldn't bump this up) @
1400x900 ran at 23 fps prior to overclocking, and 32 fps after overclocking (XBox avg 30fps/PS3 avg 26fps). GTA IV, of course, is a bad example for fps, since it was known to be a pretty badly optimized port.
Crysis (also another known CPU/GPU killer) runs smoothly on all High settings (albeit at 1200x800 res). I wish I had a fps for you but I dont :/
Mass effect 2 runs amazingly well @ 1400x900/highest settings w/anti-aliasing 4x.
I'm guessing that with WoW/SC2 graphics settings close to maxed out, you'll have a completely playable experience

Of course for SC2 I've read that it can red line both GPU/CPU temps. Which leads to my next point...
With
Lubbo's Fan Control (for Windows), my Macbook hovers around a comfortable 72C/ (GPU Temp) for most games. Crysis pushes it to 76C (but that is still completely reasonable and not even close to the i7's rated Tjunction). This is about 3-4C hotter than stock GPU clock temperatures. I know I probably sound like I'm trying to sell OC'ing the 330m, so I feel obligated to say to use
caution when messing with clock speeds.
There are plenty of guides around for overclocking the 330m, or if you'd like feel free to shoot me a PM and I'll try to get back to you asap with full on instructions
Trust me when I say you'll want to look into it.
Your 2010 is going to hold its ground for a while.
A quick question for others w/2011 MBP. Can you overclock the 2011 base 15" (6490) with Rivatuner/MSI/nvidia inspector?
OH also, on youtube check out Dwizard07's 15" Overclocked 330m videos (just type Dwizard07 in youtube search bar). He has TONS of videos of modern games running on the lower end 2010 15" mbp

he was my inspiration haha