Windows phone had the makings of something truly spectacular with Windows Phone 7, whereas with 8 I was hoping they would build on that. However no thanks to some people who don't even get the UX (i.e Games in the applist - the most visible of the changes) have influenced the MS to make silly design changes with windows phone 8.1, therefore with 8.1 we saw the destruction of the HUB model in favour of the app model & their social extensibility framework...
The irony of it all is, ios and android are slowly moving to a hub centric model and people are praising them for it - the very same target audience who complained about it in the first place when they used windows phone :grincry:.
I for one hope with windows 10 they go back to basics and bring back the hub model integrated with the app model, this is doable as software by definition is extremely malleable.