On my PC, 2 updates broke it as it wouldn’t start up the DE.
Well, did you figure out what caused the issue? There's many things besides the quality of a distro that could cause this, especially on an Arch or Arch derivative. Many Arch users have complained about their DE occasionally failing to boot up due to some random update that broke something for their specific config. Just saying that this doesn't prove much. It could have been Manjaro, it could have easily also been a bad upstream update or even PEBKAC.
A few days ago, my standard Arch system upgraded to a version of pipewire-pulse that created duplicate audio devices on every audio profile change. I could have easily just said, "Arch is a shitty distro, they can't even get audio devices working correctly", but that would be misleading. Anecdotal statements like yours are too vague to prove a point about any distro.
Devs have complained about them distributing non-master branch features that weren’t sufficiently tested or released and got their issue tracker flooded.
This isn't an issue specific to Manjaro. This also happens to any upstream project that are shipped by downstream. Many distros ship unofficial patches to upstream software, this is NOT new.
You may love it and great for you, but people won’t give you free reign to advise a bad distro
I don't use it anymore as I am on regular Arch now, but during my time using Manjaro for about a year, I genuinely didn't see much issue with it, at least no more than what I've been experiencing with Arch. I am just annoyed at how some people had one or two bad experiences and then are just jumping on the hate bandwagon with nothing much to back it up.