Granted everyone has different expectations and patience when it comes to computers and OSes, but this hasn't been my experience at all. I keep around a Dell Latitude D620 (released 2006, I think) for some uses where I need a real serial port that handled Windows 8 just fine, and still runs 10 pretty well. Bootup takes a little longer than might be ideal on its crappy slow hard drive, but it's completely usable and faster than 8 in most things. I also ran 7 and 8 on a Compaq Presario C700 laptop (was my previous laptop, released 2007) though I've stolen some parts from it so I haven't upgraded it to 10. Then I have a relatively new Thinkpad T430 as my "real" laptop, and it runs 10 brilliantly (i5, 16gb of RAM).
Yeah, I know, anecdotes, opinion, etc, but I have no complaints. I also generally have no reason to try to resell computers, so resale value isn't a concern to me. In general, Windows has gone faster and improved performance for each version past Vista for me, on the same hardware usually.