I think one of my biggest complaints about Windows is the inability for ME (the machine owner) to do what I want to do in the name of security or some other random issues. Take Extensis Suitcase for example.. I was unable to remove my FontVault, because windows INSISTED that the files were in use, even though 1) no process was running tied to it, and 2) Suitcase had been uninstalled. Thus, I had no choice but to wipe the machine. I couldn't even copy OVER the files as they were "in use". Also, when trying to delete other files, I didn't "have permission" even though I was the administrator...um, what? I was a MCSE back in the late 90s - early 2k's and never had problems removing my own files. Windows 10 stops you at every turn it seems. . . even from safe mode with command prompt.
Secondly, I'm a web-dev and run a lot of different browsers for testing... Chrome, Firefox, Safari, and (unfortunately) Edge. I grew weary of Microsoft telling me every time I launched a competing browser how great Edge was going to be... "Edge saves your battery" "Edge is faster" "Edge is more secure". I get it Microsoft, you want me to use your browser. I've chosen not to by default. Must you put it in my face every chance you get? It's like Windows has turned in to AdWare for all of MS's other products. If I run Chrome on my Mac(s), I don't get Apple sending me notifications about how wonderful and world changing safari is. And that's something I appreciate.
I should note that the 9560 XPS that I has was a "Microsoft Select" from their retail store, so the only thing that came installed was Windows 10, some Dell Drivers, and Office. Nothing else. I'm sure the Dell is great for some, it just wasn't for me.
Just my opinion though.