i think it's a personal choice thing, it's stable, it looks nicer than xp, i went back to xp simply because of the resources it uses and any program it didnt like it slowly dismantled, games installers, graphics tweeks etc. if they were microsoft games such as halo they worked fine, they did however crowbar a lot of crap i didnt want on my pc such as 'punkbuster' etc without my permission which i class (and so do my av) as spyware. i dont think it will ever be a gamers choice, that may change when the 8900 cards come out and if you have the cash to buy 1/2/4 or whatever is needed to support the next dx.
some like it some don't, i don't think there is anything very wrong with it, i just don't like it personally, so i will hang out (if im allowed) for the next o/s, which i believe will be a lot leaner. i found if vista doesnt get it's own way it changed things to get it's own way, slowly but surely! xp gives a lot more control of my pc which i paid for back to the administrator and only user, me!