I haven't had any problems with Windows 8. To be honest I use it a lot like I used Windows 7. I pretty much never see the much maligned tile interface. And then I benefit from the myriad little improvements and tweaks they've made to other parts of the OS like they always do.
I feel more like I'm using a beefy service pack to Win7.
Every time you preorder a game, you become part of the problem. Don't be part of the problem.