Yep, it's all about who's looking at it and what you compare it to. The scrolling issue, in my opinion, is totally just a matter of what you are used to. The N900 in those videos looks much more smooth than my N810. And the web page scrolling looks as good as my HTC Hero (Android 1.5). On the other hand, scrolling between the home screens looks quite laggy to me, certainly not up to my Android device's smoothness and in fact pretty bad-looking, to me. I've seen that in previous videos too...it does NOT look smooth when people move between the home screens. I hope they fix that, as flicking through home screens is the first thing anybody will probably do when they pick up the device for the first time. Not the best first impression if you come from Android/iPhone.
it just proves the platoform is not quite ready for all mainstream users