Coming from a G1 to N900, here's what I dislike on the G1 (not necessarily Android): - battery life is too short - capacitive touch screen responsiveness varies with the weather - takes forever to boot (OK, you don't reboot a phone often unless it runs WinMo) - sluggish UI - poor multitasking experience due to apps getting restarted after switching to them due to not enough memory - approx. 70 MB for installing apps, this space gets filled in no time