When I tried the public preview, my heart sank when I saw that "Store" icon in the start screen.
The new UI I can deal with or customise - I've been developing since DOS, I'm sure I can get used to it. But please don't remove the very reason Windows became so popular: a relatively open ecosystem.
As a result of that (and the destruction of VS), my personal projects are no longer under Windows, and my career is also shifting away from it.
I'm not anti-MS - I was once their biggest cheerleader. I just don't like their direction.