Most of my disappointment with the N800 was in the operating system and UI. There was absolutely no support either. I don't think it even came with a manual. It looked like it had been cobbled together rather than lovingly thought out.

maemo looked interesting, but even the firmware update method was archaic and extremely over complex. From what I remember it only worked if you unplugged the usb cable and plugged it in at exactly the right point or something! (swear to god, this was in the README).

Maybe it's all changed now though.