In my opinion, it's mostly a trend. I remember when the same was happening with Win7 and WinXP, bunch of people kept complaining that XP was faster, better, bug free, no BSOD and other stuff.

I've been using Win10 at home since it came out, never had an issue so far, not a single BSOD, or the system being slow or anything. I upgraded the hardware every 6/12 months since then and it always booted without issues. Maybe I got lucky, but I can't complain.

Win7 is a great OS, but that doesn't make Win10 a bad one and the other way around. If people don't like 10 they have all the rights to keep using Win7, end of support doesn't mean it'll die.

If you really want to find something bad about Win10, I'd say the integration between the new settings menu and the old ones could be better. It takes way longer to get to the network adapter menu now, when it was just 3 clicks before. Same for the sound control panel, you have to go through the Win10 interface to get to the Win7-like one.