I’ve ran my gaming pc on Manjaro for about 2 years. There were too many issues to list here, but the one huge problem for me for new users is updates.
You have to wait for the semi-regular “stable update” post, check the major issues and act accordingly. This shouldn’t happen in a “beginner friendly” distro. I mean, those posts are great, but all other majors distros update without intervention.
Also, I always updated from the tty as there’s a weird “never update inside Gnome” policy.