9. The Keyboard
Just about every other mobile OS has a better default soft keyboard than iOS's. It may have been state-of-the-art in 2007, but not much has changed since.
The newest keyboard out there, the BlackBerry 10 soft keyboard, is the current state-of-the-art keyboard. It predicts what you intend to type and spreads the predictions around the keyboard, allowing you to select and "flick" them up to the display. It's clearly generations ahead of the iOS keyboard.
Android's default keyboard is OK, but it also allows developers to create installable keyboards to replace the system keyboard. This has led to innovative products like the ones below: Swype, TouchPal and SlideIT.
iOS needs either to have a world-class keyboard or to allow third parties to install new ones. Both would be even better.