The point is that the n800 is not meant to be used to administer things.
OS2008 claims to have UPnP support, never tried, but it should be there.
OS2008 also sees SMB shared file systems in the File Manager.

The N800 was intened for occasional use while, for example, on the sofa.
It's an N-Series device, those are intended for fun purposes: multimedia and stuff like that.

The fact that is has Linux and CAN be used to do much more things that it was supposed to do, is not a good excuse to attack it when it doesn't do those things well.

Also, I am not a web designer, but I do recall that the websites should be designed with an 800 pixels wide area in mind.
Designing a website at 1024 pixels is wrong (or at least it should, recall: I am not a web designer).

Having 1024 pixel on a 4 inch display just means stuff becomes much more sharp (it's already at more than 200dpi!!) is that added sharpiness really useful ?
True: you could use more space, but how small things would be ?

So I am not so sure about these complaints...

unless you consider them as they are: personal