I can only comment that I have Windows 8 on a newish build and I have yet to have any problems running any games and or in anything else.
I have Steam and have played Far Cry 3, The Witcher 2, Metro 2033, Starcraft 2 Borderlands 2 etc...... If you love the start button (I don't I never used it from win 95 onwards) then you can download a program called 'Start 8' to reinstate it.The Metro interface I just don't use
Desktop is one click away from it.
Thats just my opinion though, theres plenty of hate for Win 8 around its down to what you want really