The best interface
The Win8 phone interface was by far the best. Clean and customisable. Car mode made it simple to whack a bloody great icon to launch Here Maps (which I still use on Android).
Updates did depend on carriers, but this was easily bypassed to get them straight from MS, so none of the Android abandonware.
A lot of the issues was the lack of apps... review sites (including The Reg) bemoaned the issue, ignoring the fact many add one (think the 10,000 torch apps) were already standard.
Google had no interest in supporting it and people were moaning the could get Google maps...which I never got, Here Maps and the fantastic Here Transit were far superior.
However you knew the writing was on the wall when MS decided to putits own apps out on iOS first, then Android and then maybe sometime later it's own OS.