And maybe I'm missing something obvious here... but what exactly are you guys complaining about?
If it's that Windows may contain unnecessary functionality that just uses hard disk space and memory, well, d'uh, welcome to EVERY SINGLE VERSION OF WINDOWS SINCE '95. Certainly I'd like to have the opportunity to either uninstall this thing, choose NOT to install it on setup, or just turn it off.
But... it seems to me here that MS isn't talking about a second "Games for Windows Live" experience. (My sole example of which was paying for "Bioshock 2" and then finding out that unless I signed up for a "GfWL" account, I COULDN'T SAVE MY GAME. Also I have to wade through about ten pages of MS bulls--t propagandizing to get there. And even when I actually tried to sign up using the username "f--kthiss--t2038523", I kept getting the error message "cannot connect to server". Never again, thanks.)
Seems like this thing may not be voluntary in terms of INSTALLING it (which is, I admit, irritating enough, but as I've pointed out above, that's been pretty much common with every new feature of every new version of Windows since '95) but it is in terms of USING it. You have the option to ignore it. It might provide some kind of competition to "Steam", which can only be a good thing. (Again, the way I found out about "Steam" was because I couldn't play a game I'd already bought unless I signed up to it. Gee, thanks! As much as I like Steam for what it's doing now, it just annoyed me back then.)
So... a service that you don't have to use, but if you do want to use, it will presumably give you additional access to content such as games markets, etc. What's the negative here? I don't get it.