People would be better off if they turned off the notifications. Even better would be if notifications were at first off, rather than on. Your phone should ring for calls and beep for text messages, and that's about it. Well, it should buzz if you set an alarm. But it should not interrupt you for an email or post on Facebook. Each app you install has all notifications on at first too. I think it would be healthier for all to be off. On first launch, the new app pops up a screen with checkboxes for each kind of notice, with all unchecked. You have to put a check in each one yourself.
Other than that, the only problem I have is that the average screen is too big. The right balance is about 4".
I like having all these things in one device: map, flashlight, camera, calculator, walkman, encyclopedia, newspaper. Then again I am not tempted to open it while driving.