Zune HD is the best mp3 player and software ever made to this day (iPod touch and iTunes still isn't as good), the Surface wasn't perfect but new hardware is coming out soon and will make the Surface 2 Pro the best tablet/ultrabook on the market, and Windows Mobile was good for its era. Everything people love about Android - custom ROMs and themes, the ability to run emulators, being able to overlock the CPU, etc - all existed on Windows Mobile first.
The real problem it had was Microsoft didn't refresh it with capacitive touch and an app store fast enough, almost everything else would have improved with better hardware had it been continued. Windows Phone is good, though, much cleaner and smoother, and with an interface that is easier to use than iOS 7, even though it's locked down like it and lost the customization options of WM.