Firstly I never wrote that I represent entire user-base. However, I do feel that many sysadmins share the same feelings about systemd as I do. At least I never heard praise of systemd from any of my peers.
systemd requires time to understand in its entirety. I'm not speaking about ability to start or stop particular service or init-script, I'm speaking about understanding the grand picture of how the new startup works in detail, what all those files in /lib/systemd mean and how they interact with each other.
Without having a good grasp on the startup process overall, one is unable to quickly troubleshoot issues. This causes a commercial risk of longer downtime, as sysadmins will take longer to bring the system up in case of a fault.