I don’t necessarily hate Manjaro, but I do think people shouldn’t use it. Besides the things people have already said, Manjaro goes against the spirit of what Arch is supposed to be. Arch has everything you want and nothing you don’t. You set everything up for yourself so you know exactly how your system works and why X package is installed. You tailor the experience for yourself rather than having someone else tailor it for you. If you wanted that you could just use a distro meant for that in the first place like Fedora.
But even if you really, really, want preconfigured Arch you could just use EndeavourOS. It uses the normal Arch repos and has basically none of the issues Manjaro has in terms of security and stability. There is not really any good reason to use Manjaro over it.