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You first.
But, to answer your question, games like TF2 weren't designed to take full advantage of multiple cores. Most of the processing is done on a single thread and thus runs on one core. I don't know about Crysis, but it's probably the same.
Developing games to utilize multiple cores is a big challenge. Valve is working on it and I know they have some tasks that are split up and run in parallel on multiple cores.
In order to take full advantage of a quad core machine, the game would have to split itself into at least four processes or threads that may be run in parallel simultaneously. The traditional design of a PC game won't work with this since tasks typically have to be done in order and/or one at a time.