Positive
- Slightly enhanced command prompt.
 - Windows 7 backup solution is back, but perhaps something new and better would be good.
 - Multiple real desktops and switching.
 - Snapping windows to corners.
 - Snapping windows to the left or right side makes the window fill the remaining space; this is nice 
but now it's harder to fill only half of the screen. Edit: After the last cumulative update, the control key actually does modify the behavior. I was sure it did not – at least before the update. - Easier to adjust audio volume precicely; not because the resolution is higher, but because the control is larger.
 
Negative
- "MBR error 1" on first and consequtive startups after upgrade; solved using commands:
        
bootrec /FixMbr bootrec /FixBoot - Make sure to uninstall Microsoft Security Essentials unless you want to waste time upgrading again.
 - New Photo viewer:
 - Zooming and panning is blurry and blocky, especially while panning.
 - Browsing pictures shows rectangles with a solid color instead of the pictures themselves.
 - Cannot remove pictures (from the UI list) that were previously set on the lock screen.
 - Cannot remove custom high contrast themes. Speaking of that, the amount of options is poor.
 - The font in certain textboxes (particularly search box in Explorer) makes it harder to read.
 - Fine-tuning color of taskbar without changing the color of other things as well seems to be impossible.
 - I have turned off animations globally in Windows, but all modern UIs still animate stuff, including the start menu.
 - Start menu:
 - Documents folder on the start menu is now by default an extra click away.
 - No way to easily remove multiple (live and app) tiles I don't want on the start menu.
 - Noticeable delay before the start menu shows up.
 - Context menu for search results (files, desktop apps) in the start menu is crippled (no shell menu entries).
 - Cannot drag and drop any search results (files, desktop apps) from the start menu to any control/toolbar that accepts dropped files.
 - No distance between border/edge and text in command prompt.
 - [Right click taskbar > Properties] opens "Taskbar and Start Menu Properties", but there is nothing for the start menu there.
 - Command prompt still does not display unicode characters.
 - Harder to see what part of a window is draggable (e.g. caption) because everything is a single color.
 - Disabling Windows Defender is harder (use gpedit.msc).
 - Mixed quality icons (amount of color, proportions, design). 3D or 2D, few colors or many, few details or many... Particularly not a fan of the new shield icon.
 - No shortcut keys for switching to specific desktops (e.g. desktop #1-4)?
 - Default privacy settings are intrusive.
 - I somehow managed to record a "game", but actually I was just my web browser. When I try to view my recordings, the app just closes after a few seconds (maybe crashes).
 - After hibernation or locking the screen, the logon/lock screen does not get ready for input when pressing down the shift-key.
 - The File Explorer window sometimes flashes as if it closes and re-opens, and the current selection clears. Workaround: Do not open new windows in separate processes.
 - After closing the File Explorer, it sometimes re-opens immediately afterwards. Workaround: Do not open new windows in separate processes.
 - While doing something with the start menu and/or the File Explorer, I got an error message from RuntimeBroker.exe: Not implemented
 - The UI language in the OS is English, and my region settings are set to Norwegian/Norway; yet, the modern apps are actually in a completely different language (Japanese). Maybe because I once upon a time set the region of my Xbox 360 to Japan.