It's a subpar keyboard in the sense that it is smaller than a normal laptop one, with limited key travel. I have tried several of the keyboards associated with the windows 8 tablet platform and haven't encountered a satisfying one. I similarly don't like the physical keyboards for the iPad for that matter.
Don't forget that Apple has been playing the same game with their laptop keyboards. The travel on my Retina MacBook Pro's keyboard is terrible compared to the previous non-retina MacBook Pro, and that again had less travel/spring in the keys than the original MacBook. And personally I think the older MacBook Pro's sculpted keys were much better than the flat chiclet style they use now.
Wherever possible, I like to use a proper desktop keyboard with sculpted keys and full travel. (Topre keys are my preferred choice)
Have you ever tried using a Windows 8 tablet in the office app or desktop environment? I did and it sucks. Microsoft (and in this case Nokia) basically made a premium netbook with a touchscreen.
I don't know about this Nokia device, but the Surface Pro is essentially the same hardware as the 11" MacBook Air - unless you also consider that to be a "netbook"?
What I respect that Apple did is that they created a new category for different use-cases, are sticking to it and engineer the software towards it. Microsoft tried to do the same with the start menu and the apps, but the normal windows environment behind it is just not usable on a tablet, unless you add a keyboard, and then you are basically using a netbook.
And this is what I'm talking about when I say that they are marketing these devices wrongly.
You don't use desktop apps when you're using it as a tablet - you
could, but unless it's something like a fullscreen game, you wouldn't want to - you use tablet apps. While the app selection may be limited in comparison, it's every bit as good a tablet as an iPad when you use it this way.
When you're at a desk, you can use desktop apps with a keyboard connected. Now it's every bit as good as a MacBook Air.
Except you're not carrying around an iPad and a MacBook Air, you have one device that serves both tasks, and you don't have to sync data between them. For example, if you have a document on your MacBook that you want to read on the iPad in a more leisurely fashion.