I dunno. Innovative? No. Setting the bar for the quality of the multiplayer service? Yes. And in fact that's what it was awarded for.
"Ultimately it is the integration and coherence of Halo 3's online content that makes the game stand apart. From its Theater mode to Forge, and the way a party playing through Live can seamlessly manoeuvre between them, here is an experience that demonstrates an unparalleled understanding of the potential for console online play. Outside of the game, Bungie.net has been engineered to become a remarkable resource for Halo 3 stats and communities, providing life for the game even when your Xbox 360 is switched off. Halo 3, just as Halo 2 did before it, presents a roadmap for the way online will be integrated in videogames in the coming years."
Which makes sense, but I still can't grasp how that's really innovation. It's adding in a couple new game types, and then just improving everything that everyone else has done so it's more shiny like, guv.