You heard something that was true when it was released but which is completely wrong now after many updates. I finished the game from A to Z on Linux and while it still have some crashes it's perfectly playable even on a medium configuration (amd excluded, but that does without saying on Linux right now)
I can't play The Witcher 2, at all. It literally kills my computer, both on Jessie and Sid. After a few seconds in the game my GPU crashes or the kernel panics. It's most likely because of radeonsi.
No, I think they work with the AMD binary blob driver as well, but they have some display/compatibility issues with the drivers on those. You should check the official GIthub trackers for Witcher 2 and Bioshock Infinite, some issues are reported there.
Fair enough it was a little time ago, glad to hear it's better now. However, even though I have been gaming on Linux for years, if playing a high-end title I encounter any performance problems I see no reason not to switch to Windows. You pay for the hardware and the game to have a high-end experience and then you limit that, for what?
Having said all that I have been buying lots of games from GOG and have been really impressed with the quality AND quantity of linux versions.
