A lot of the people I see complaining about it are comparing to what was before it.

As someone who has only ever known systemd, I have no issues with it and, dare I say: I like it.

If you rely on /r/sysadmin to do your job you have other issues to worry about. Most of the posts are career related or simply just work anecdotes anyway. Technical posts are a lot more common in more specific niche subreddits.