By the sheer fact that you mentioned games I'm going to recommend
a desktop, not a Mac one, probably self assembled or bought from a manufacturer with a gaming focus, a $1000 Dell desktop probably won't be much more capable. (at least a £700-£800 Dell in the UK isn't)
If you are serious about PC gaming you should get a gaming desktop, if you want a laptop for general use, the Macbook will be fine.
The problem is that the graphics card in a Macbook, and other similarly priced laptops is the GMA950, which is OK for Half Life 2/Counterstrike, but games like Oblivion certainly won't run. TBH Even with an MBP you won't be able to run new PC games at all for more than maybe a year (especially as they haven't updated it since January 2006).
Enough of the negative, Bootcamp runs a full installation of Windows natively, it will be just as fast as a similarly spec'd PC.