Yes. WoW, the settings [may] have to be turned down just a little. I don't know exactly how low, as I don't play, but Guild Wars is a very very similar game and runs pretty much perfectly on my late 2007 entry-level Macbook on the highest settings. Counter Strike Source will also not be any problem.
Edit: On second thought, WoW only requires 32MB Gfx cards that are pretty old and is a pretty low-specced game. You shouldn't have any problems at all.