Like most people who don't use Win or Mac, I started off my Linux journey with Ubuntu. This was 2007 or so. I eventually (through a story far too long to relate here, particularly since it's not relevant) settled on Puppy Linux of various varieties for my main distro. Puppy, AFAIK, uses BusyBox Init. When SystemD started being developed, it was universally reviled by almost the entire Puppy community... we lost a couple members that way, IIRC.
Anyways, I have heard a lot about SystemD, almost all of it negative. While I have not, to my knowledge, interacted directly with the devs of it, I have heard that they tend to dismiss any bug or issue they are notified with, as "not our problem" -- the underlying attitude being, why make more work for us when you can change your code to adapt? A similar attitude seems to be prevalent about adopting it -- hey, new kid on the block, let's get to know each other -- and to heck with anyone who doesn't like it.
I find those sorts of attitudes troubling, to say the least. It reminds me a little too well of the Borg, from Star Trek...
Yet, my distro of choice right now is not Puppy. (Another painfully long irrelevant story.) I'm using Linux Mint 18.0, and it runs SystemD underneath everything. So far, I have absolutely zero complaints. SystemD has not yet shot my cat, metaphorically or otherwise.
Am I converted? No. I am still skeptical. Would I choose another init system, given the choice? Absolutely. Puppy's cobbled-together nasty pile-of-patches mess of a BusyBox Init served me well for many years and I'd take it back in a heartbeat.
But is SystemD something that keeps me up nights chewing my nails about whether or not my computer will boot tomorrow? Absolutely not.
I have my concerns about how SystemD has been formed and how it propagates. But, by the same token, the people who designed it are not complete idiots, regardless of how developed they are (or aren't) socially, because it at least seems to work well enough to withstand everyday use... so far at least. I know that SystemD tends to be a divisor amongst Linux users and devs -- you either really love it or you really hate it -- but I find it a little hard to get passionate about it, one way or the other, at this point.