Perhaps you have had no problems with systemd because you aren't trying to use it to do much.
Lots of people, myself included, have had issues trying to get things which are trivial in pre-systemd or on other OSes to work properly and consistently on systemd. There are many, many, many examples of issues. If someone asked me for examples, I'd have a hard time deciding where to start because so many things have been gratuitously changed. If you really think there aren't examples, just read this thread.
On the other hand, I have yet to see real technical discussion about problems that systemd apparently is fixing. I honestly and openmindedly am curious about what makes systemd good, so I've tried on several occasions to find these discussions where good technical reasoning is used to explain the motivations behind systemd. If they exist, I haven't found any yet. I'm hoping some will appear as a result of this thread.
But you bring up the idea that the "market has spoken"? You do realize that a majority of users use Windows, right? And people in the United States are constantly electing politicians who directly hurt the people who vote for them more than anyone else. It's called marketing. Just because something has effective marketing doesn't mean it doesn't suck.