Seems like the SteamBox has the same issues as SurfaceRT:
- It's an unknown quantity.
- Has little app support compared to competitors.
- Existing apps must be ported to it and some rewritten altogether.
- There are already many other options in the marketplace that provide a similar function.
That's largely true, but the comparison is a bit of a stretch.
A tablet (or a smartphone, or a laptop) can be made indefinitely useful with just a handful of applications. By contrast, a game console needs a constant stream of titles being ported to it or it will soon become as useful as a doorstop.
Also, if you want to - say - browse the web, it doesn't matter much which browser your tablet provides, as long as it does a decent job. But if you want to play some specific game, no substitute will ever do.
Bottom line: the Surface doesn't have it easy, but that's a walk in the park as compared to a new game console.