First off, systemd is not an init system, it has an init system as part of the systemd suite. systemd is a project to build a standardized low level userland for Linux. The project is pretty comprehensive and it delivers a lot of functionality under one umbrella. It does away with a lot of older, often poorly maintained software packages, which were traditionally used to assemble a low level userland.
Which is where the contention comes from, as a system suite systemd is restrictive for Unix virtuosi who are used to tailoring a system with wit, ingenuity, and a prayer alongside a couple dozen unrelated packages. systemd makes such knowledge useless.
The faction that thinks that systemd is Linux's Hiroshima claims the added functionality as bloated, unnecessary, and dangerous - as it is all under development in one project.
All the systemd jokes stem from the comprehensiveness as a low level system suite. People against it love to joke that one day systemd will become its own kernel.

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