I can no longer swipe up to access app functions. Instead I have to try to hit a tiny button in the app title bar.
Or, RTM and find you can also swipe DOWN from the top to do the same thing. They did that as the new touch cover hides the bottom of the screen.
The Start Screen can be easily returned and will work the same way it does on 8/8.1. Hint: Consider a right-click on the taskbar...
If you feel the need to badmouth stuff, at least do it fairly.