Please unconfuse me, is the "it" in your opening sentence referring to Systemd or the Init system.
Like all new replacement functionalities, there are teething problems. Already, systemd is stable and easy to use as a system management tool.
I find systemd just fantastic, considering it's age and the progress made.
I guess, thats why SUSE' RedHat, Ubuntu and Debian have evaluated systemd against their existing init system and made the switch. Resistance to change reminds me of the expression.
When the only tool you have is a hammer, everything looks like a nail.