I know how many people hate systemd. I started reading about it a week ago and I am enjoying it. Seems a much better alternative to previous things.

Is there something bad I should know about...

CHANGE BAD!

Because it suffers from a second system effect, in considerable part because Poettering has an inclination to code things that are more complex than he can manage, as was already seen with PulseAudio.

And because upstream (i.e. Poettering) is usually unsupportive if any problem arises, the docs aren't good, the logs aren't grepable, and the whole thing is a PITA when anything doesn't work.