Systemd, as a replacement init system, is fine-ish. It's sometimes slow and when it decides a service is lost there's not much to do aside from killing the thing and restarting it.

Systemd, the full blown ecosystem that wants to replace literally everything by systemd-thesamethingasbeforebutfromscratch however, invites scepticism, especially when there are no particular flaws in the existing versions of things. DNS resolution, DHCP clients, NTP sync, etc. worked perfectly well.