Found 51 CVEs relating to systemd since 2012 in a naive search[0]. All software of systemd's complexity has bugs, but a CVE every ~2 months over 7 years isn't hugely encouraging. Never mind the ever increasing surface area as systemd seems to take on ever increasing amounts responsibility in an average Linux system. I'm absolutely biased and have been unconvinced from day 1, but I've not seen much to dull my scepticism either.
[0] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=systemd