And people bash iMacs....

The equivalently priced iMac comes with an AMD Radeon HD 6750M (slightly smaller screen). Install Windows and call it a day.

But seriously, if you want to game at all and are still within the return window. Return it and look into other systems. You can still get an all in one, just check the graphic processor that's included with it first and don't be fooled by claims of "Intel HD's Lush Graphics".