I was willing to learn it (I mean, I learned Solaris SMF, which is even more opaque, and I even sort of understand OS X's launchd). But I got very irritated with a number of bugs that no one seemed interested in fixing because they only affected servers, not the desktop machines systemd targets. For example, it became impossible to reboot a machine via ssh if it had automounted NFS shares; it would hang in the shutdown process every time, requiring physical power cycling. Bug reports about this were met with a collective shrug.
Personally I find FreeBSD's init system refreshingly simple.