http://www.notebookcheck.net/AMD-Radeon-HD-6750M.43958.0.html
You will get decent performance from many games at mid to high settings, more demanding games will have to be run at low settings, nothing like the doom and gloom answers from the previous posters. You will be fine playing lots of games.
Yeah the 6750 is not THAT bad. It will run most modern games at medium settings just fine, and many you will be able to tweak up the settings even more.