If the issues is related to a specific GPU then that's a hardware issue. Unless the whole system is having graphical errors then its not really Apple's fault that a game can't run under an update.
Also, Yosemite is definitely far from being ready for stable regular use. Thats why it a developer preview and they even say themselves to not use it as a main OS. They have the upcoming public beta for people who just want to day/do vigilante bug squashing.
In a situation like this, all you can do is tell the developer and hope it gets fixed. You can't really do anything else about it.
And that's exactly why it's okay to ask questions like the OP did- to determine whether or not it's an issue related to the combination of his specific hardware and Yosemite. Maybe people with other hardware configurations don't have the same issue? Either way, I'm pretty sure the OP knows that the issue won't be fixed until after Yosemite is officially released.
For some people like myself, Yosemite has been ready for stable regular use since DP1. The worst issue I have faced is Safari crashing on occasion, which is completely acceptable being that it's a developer preview. I have had no other issues, and it runs great. Still, I know that I use Yosemite at my own risk, and I have backups in case things do go wrong at some point down the line.