I wonder why the author tried to treat this as a full desktop replacement knowing that this is ARM based unit and hence does not run full windows 8. The Surface Pro is the one that should fir the bill of a tablet that is a laptop replacement. The author is expecting things from the unit that it is not quite designed for.
It has an awful lot of affordances to make it look like it might be a laptop replacement -- the keyboard covers, the desktop mode, Office. It's obviously not suitable simply as a laptop, nor is it a very credible straight-up replacement for an iPad, at least at this point.
So if it was going to succeed at something, the most likely outcome would be as a good-enough laptop replacement and a good-enough tablet replacement, even though it would be a compromise as either. Instead, the reviewer came to the conclusion that it was more of a "neither fish nor fowl" product. Having not had a chance to use one myself, I nevertheless suspect that will be my conclusion when I have a chance to try one out.
I get that it was not a replacement for a desktop. That's a given. but I don't get "not a replacement for iPad" part. I don't see why it is not a replacement for iPad for doing most of what people do on iPad, browse, game, read, watch, listen, etc. If you consider broad app ecosystem, nothing is going to be a replacement for iPad except iPad. Agreed Windows8 doesn't have a whole lot of apps at this point but its not even released yet.
Android doesn't have nearly as many tablet apps for full-size tablets as iPad has, but it definitely has an app ecosystem. Windows RT is starting almost completely from scratch -- like previous marketplace failures like the Playbook and the TouchPad.
If Metro apps take off, then in 6 months to a year, Surface could be a completely viable iPad replacement. But right now, you would have to have a pretty limited set of needs to be satisfied with a Surface.
Worse, I've read more than one review claiming that the software is still glitchy. While understandable in a 1.0 product, that's a huge disadvantage when compared to the famous stability of an iPad.
So while I'm sure there will be some interest just because it's a cool-looking product, I don't think more than a small minority of users will find it a realistic substitute for an iPad.