Except you're wrong. The Athlon X4 750K/760K are on par for the FX-6300's performance for less than the FX-4300 CPU's. On top of that it's a newer chipset so you get PCI-express 3 for cheap, SATA 3, USB3, and it all uses DDR3--which is handily better than the bottlenecked mess that is LGA775 at this point. I am curious about what most games are, because a lot of the games out there benefit heavily from CPU bumps. Any MMO, any RTS, any Simulation game, and quite a few more. I suppose by any you mean most FPS's, but even the likes of BF3/4 and the Metro series benefit greatly from CPU performance.
Most of the newest AMD quad-cores (APU's being an exception) are on par for Nahelem level Intel CPU's at least, which handily outperformed the Q6600. All of that being said, I would recommend an i3 or i5 over anything AMD has to offer because you can get all the shiney features AM3+ lacks for a decent price and if you don't plan on overclocking can get decent CPU's for solid prices. In GPU bound games an i5 is on par for an FX-8350, and in most CPU-bound games it blows it away--especialyl games that favor Intel's architecture like MMO's and RTS's.