Overall performance in menus and lists. I can see tearing/jerkiness and panning/scrolling is not smooth. For example scrolling photo thumbnails or sms messages is not nice experience. It should be as smooth as microb/pdfreader panning on pages.

Knowing that there is people who do not see any difference between 25 fps and 50 fps so I do not have high hopes for any updates for making menu navigation any smoother.

GPS and maps is huge dissapointement. As I said earlier it´s about extras testing quality when compared google maps mobile or even comparing to nokia maps 3.

And people praising email have to use some kind of drug what I also want :P

Camera/video quality is also not what i expected.

On the another hand there is small things that i really like. Multitasking beign of course the nicest one, but yeah overall picture of N900 is work in progress and maby they shouldn't have advertised as they advertised :|