I like the idea. I hope that it will be as easy as you believe it would be, but I will hold my skepticism to myself for now. For the most part, I stay in the dark when it comes to a new game coming out simply because Reach was completely spoiled for me thanks to a forum post that I was ignorant enough to think was harmless.
I think a custom game browser would be lovely; Somewhat similar to Battlefield 3 in its prime, easy to avoid the terribad servers and awesomely simple to find the dope servers. I'm pretty sure it'd be a tad difficult for it to work out as easily as it seems, but I'm gonna wait it all out 'til it's released. Sure, I don't enjoy some of the decisions they've made for the sake of "quality" (in reference to removal of split-screen), but I'm willing to just wait it out to find out for myself.
Solid idea, though. Can't wait to see if it's implemented or not.