My opinion of Windows 10 is basically that it's like Windows 7, but everything is a tiny bit more annoying. Taken on its own, each problem is a non-issue, but when combined, they add up to be time wasted upgrading at best, and disruptive at worst...
My most ready example is the inability to preview images in Windows Photo Viewer. I have .PNG files set to open in Fireworks, but under W7 I could Right click -> Preview and they would open. That option has been removed for no discernible reason in W10. Massive end-of-the-world problem? No, but it's still really annoying when the alternative is now:
■ Select file (just right clicking gives me the folder options, even if I clicked on the file not the background)
■ Right click, Wait for the spinning wheel of doom
■ Open With... Spinning wheel
■ Choose Default
A lot of simple stuff is make difficult in Window 10 also there seems to be a few features is removed but you can reinstall window photo viewer in window 10. I'm not sure if it is related but when i select an image and right click and click preview, it will open in window photo viewer.