So you have to buy (and use :yuck: ) Windows 8, as well as pay a subscription fee? It would probably be cheaper and more convenient just to buy a 360.
Actually, the service described (Games for Windows Live) utilizes your current Xbox Live subscription. Meaning that you would only need one to play on both the 360 and the PC.
My complaint is that I can't currently be signed in on my PC and my 360 at the same time, nor does Games for Windows Live support party chat right now. <_<