What's wrong with the service? It's (generally) quick, constantly updated, and works quite well. The only times I've ever felt let down is when there's a big demo or content pack being released, and the whole Marketplace crawls somewhat, but even then, it's never THAT slow that it's been a problem.
But I guess with the EU marketplace being launched soon, Microsoft have probably realised they need more bandwith in place to deal with the video downloads from another continent etc.
Still, I find the whole Live service a fairly good deal.