Most of the hate is because of the maintainers not maintaining their security certificates. Another similar distro is EndeavourOS, which I personally prefer. But either way, find what works for you.
Just out of curiosity I've looked for that a couple of months ago and I found that it's relatively easy to transform a Manjaro installation to Arch and Endeavor. IIRC it was just adding new repo keys and changing the repos. People attempting that would have to look the guide up for details.