I have a year and half old laptop with the GTX 560m with the i7-2630qm (quad core). It can run anything including Crysis. For graphically demanding games, it usually runs them at medium to high settings. Usually ultra settings are out of the question for smooth gameplay. If I am not mistaken, the GTX 660m utilizes the new Kepler chip which is an improvement, so you are good to go with any game you want. It will make them all look beautiful.
* one caveat is that your CPU may be a dual core that can run 4 threads. I don't know if that matters much since most games supposedly do not take full advantage of quad cores.