Update:
I use Win10 on my phone.. And no, no I just don't like the navigation, no way. It sucks compared to 8.1
There's a reason I have ever touched a WP coming from Android (I like It), but I also like how WP is different and I really got used to it so much that anything else is annoying ("new" UI and navigation). And even If I like it, it's not as much as 8.1
8.1 UI is not perfect either, it needs new shapes, icons, color, SMALLER FONTS in some areas, and stuff like that.. But that's It. Why fix something that's not broken, just improve your Design ..
+ Improve gesture navigation
Why would anyone switch to WP, if It looks like un attractive version of old Android design without apps, from Perfectly shaped Material design.
No, we don't know how it's gonna look in the end, and I believe It will look Beautiful, but I don't like the way it's headed now.
Why do I Care?
Because WP and Microsoft gave me inspiration and actually made me fall in love with mobile devices, phone designing and UI design way more than anyone else.. And now it's turning mainstream like musical bands..
I'm not going to support something that I and many more don't like just to be liked by the community here because "unliking anything MS-made" is "hating" You can believe me that no matter how many MS devices you own, I probably care a lot more. And as someone may read this from MS, I think its good.
I'd rather encourage them to improve Modern design..