There's no such launcher on Windows that doesn't deal with the pitfalls of it being Windows. Even something like Steam's Big Picture doesn't really work very well in certain circumstances because you can be thrown out of the launcher onto the desktop unexpectedly by games it launches.

I think the only way we could see a good implementation of this is if Microsoft themselves made it. They tried doing something like this with Windows Media Center but I think that they're better positioned to try again now that streaming services are ubiquitous.