The rMBP already was a step back in gaming graphics from the previous generation cMBP. Asking for a second regression in a row is brutal.
Expecting gaming graphics performance out of a Mac is where you did it all wrong to begin with. The retina display is something any real gamer understands is actually a huge drawback for gaming on, because its native screen resolution will tax even the most powerful desktop GPUs.
You cannot expect portable + power + hi-res screen + battery life + etc all to come together... its a balance. Even the Razer Blade which has the small form factor relies on a much lower resolution screen to keep things manageable for its 765M and totally throws the battery life and power consumption as nothing more than whatever the battery can provide.
It sounds harsh, but its misplaced expectations... gaming graphics is just contradictory to other things such as portability, battery life, power consumption/green factor, etc.
This is why any real gamer understands that there's a huge inherent compromise with what people are trying to do here and are asking for. You want a Ferrari and you want to carry enough 2x4s to build a house in your Ferrari too... things just can't be built that way.
And the rMBP is not worse performing than the cMBP, if you game at the same lower resolutions. Its just less visually appealing.
On one hand some people are trying to say not everyone needs a gaming desktop/second rig, and then on the other hand the same people are saying the performance is not enough for them. If you can't live with the compromise, then you really need to consider than what you're asking for needs a more purpose built platform to satisfy your needs.
I really don't know what else to say - that's just the literal truth. A compromise is always a compromise, its just accepting it or shopping for something else if it isn't acceptable. The other alternative is to just skip a generation, and wait for the Broadwell refresh.