Different things for different users. Although I don't like systemd, it's not a big deal for Average Joe who's just browsing the web and playing games. But for servers and some workstations, it creates more problems than it solves, if it solves any at all. My server only boots up once every few weeks at most, I don't care how fast or slow that is. My server doesn't need pulseaudio. I'm never adding or removing devices to it so I don't care about udev. Systemd is in many ways a solution looking for a problem. What started out as an init system revamp turned into an all-encompassing machine management framework that doesn't play nice with others. The project is run with an iron fist and they don't care if their code is interoperable with other modules, they want you to use theirs. It's no good.