Microsoft knows exactly what they're doing. And I agree, due to it's similarity to a conventional laptop, they won't sell as much as they could. That being said, the Surface Pro is a bad-ass piece of machinery, and probably going to be hard to beat any time soon.
Aside from those points, I agree with what you said. From my perspective though, who in their right mind wouldn't want a tablet with a dual-core hyperthreaded Core i5 with 4GB of RAM and a beautiful 1080p screen?