The review seemed totally fair to me. I own a N800, which I enjoy playing with, but consider it solely a toy and probably the first of all my devices I could do without. In terms of usefulness, it may be great for System Administrators, programmers and linux hobbiests, but the absence of useful mainstream type applications like PIM syncing with desktop and Office type document manipulation, will forever relegate this device to a very small niche market. After all, if it can't satisfactorily replace other devices you carry, it simply becomes another device to carry. As for the functions it does perform, it doesn't excel at any of them. It isn't a great media player and even it's primary function leaves a lot to be desired (try watching videos browsing on CNN, for example).
I read all the objections thet it isn't intended to be a PIM, etc., but limiting it to a device for accessing the internet will ultimately kill, what could be a great device, dead. Specially since it isn't even great at that yet.