When iOS was new, it was incredible. But it's mostly failed to evolve since then. There have been a few minor improvements over the years, but Springboard in particular feels really old, especially for the iPad. And many of the first-party apps are poor.

Apple has succeeded in the mobile market largely because of their excellent hardware and their app ecosystem. But iOS itself is a little disappointing. It's due for a major evolution, not just more incremental tweaking.