Gamers should hold off in the short term. Why deal with the early issues when you could just wait a few months. It's worth buying now at the discounted price though.
I have been running the final version of Windows 8 for almost two months now and its been flawless for me, you have to remember this isn't really a new O/S its a streamlined/improved version of 7 so its hardly going to be glitching off the scale.
The majority of all issues people seem to be having are with new rushed beta drivers, which is pretty silly when Vista/7 drivers work fine.