Looks like Sony has a good head start with the DL/Indie games. Once ID@Xbox gets going the release list will look much more balance as Microsoft will have filler titles as well. This generation we're going to start seeing numbers thrown around just to throw them around. It's going to be like Apple and Android app stores. We'll start hearing "We've hit out 1000th indie game" but in reality only 10% are worth a damn, if that. I'm looking at you Fart app.
And that is where the front end interface and filters for this stuff need to improve.
There are thousands of indie games on 360 but you have to wade through a lot of awful Minecraft clones to get to really decent stuff. That's even with user ratings and filtering by rating/popularity. I imagine there are lots of hidden gems that never receive exposure due being buried by the shear volume of content.