@romin There are some valid criticism about its design and scope. There were some controversies about how quickly it was adopted by most of the GNU distros, which can be said for a lot of Red Hat software. I don't really blame the distro maintainers for it though, it does make their life easier by streamlining a lot of the things.
But that doesn't mean all the complaints are valid. I've seen Mac users talking about how bad systemd is. It's not really the kind of software that normal users interact with directly, except for the things like writing service files for your own software. But anyone who says SysV style init scripts are better is completely wrong, BSD's rc.subr makes it much, much better, but still requires weird hacks in some cases. People also complain about the scope of systemd, but aren't bothered as much by the bloat in their browser, compiler, kernel or even the bootloader.