Newell, head of Valve, has infamously stated that Windows 8 is "a catastrophe" for games development. Plenty of others have echoed the concerns, if in less strong language, including Blizzard, Stardock, and Markus "Notch" Persson of Minecraft fame. Valve, as a result, is hedging their bets for the future by trying to expand into Linux, and bringing more gaming there. After my frustrating days with Windows 8, that looks like a good idea.
It's not exactly that Windows 8 doesn't work. It's fast and, from my still-limited experience, stable. Programs, once open, run well. The major issues are twofold: first, Microsoft has inserted several extra steps into the process of performing basic functions like "launching a program" or "shutting down the system." Second, the parallel tracks of the "Metro" and Desktop environments give it what feels like a split personality. The overall result makes it challenging to navigate smoothly, and will likely frustrate many gamers.
Interface clunkiness, while annoying, is something a user can learn to live with. I've been navigating Windows since version 3.11 and while this feels like the clumsiest, most awkward, and least smooth iteration yet, a person who has to can adapt to almost anything. By the end of the third day, I had internalized the odd sets of mouse gestures I needed in order to get around. That workarounds are relatively simple to use and memorize doesn't make it a good idea for Windows to have ditched the basic premise of windows—panels that can be moved around and looked at and manipulated—in favor of full-screen permanence, but even if it will never be loved, at least it can be grudgingly lived with.