WP8 - Microsoft's failure
The most distressing (from a WP8 owner's point of view) thing is that WP8 is really not that bad. I've likened it a lot to early Android but with more polish in some areas. Unfortunately Microsoft dropped the ball in a massive way by updating at such a slow pace. They needed to come out with WP8 and then aggressively update it so it was at a similar state to both Android and iOS within the first 12 months. That might sound too fast but they've already had a year with their other failure - WP7.
The notification issue is a massive missing step but overall there are a lot of minor niggles that really make using it a pain. I've tried many times to like it because I have a really nice looking phone but when I feel like I'm fighting the phone to do what I want it's more trouble than it's worth. The biggest annoyance for me continues to be the awful keyboard. If I press "i" as a first letter then both Android and iOS offer the word "I" as a suggestion first but WP8 has it a scrolling bar away. It doesn't learn at all and sometimes it will offer the correct word but without bold meaning you have to tap it instead of just pressing space to continue. It really feels like a kid at school scared to do anything without asking the teacher first.