I ran a laptop on Solus for a couple of years on a laptop as a long-term test. I used it for a year and then my wife used it for a year.
I found their repos to be more than adequate for casual use. Are they as big as Manjaro repos+AUR? Not even close.
For me, Solus is the closest thing to a traditional Linux distro that can be used purely graphically. I deliberately tried to use it without a terminal or TTY and I was generally successful. I think for a casual user, it is excellent.
For a power user who like to customize, I think there are better distros. Like with any distro, it is all about use case.
When I find someone who wants to try Linux but is the type that just wants it to work and it doesn't want to worry about the details, I usually recommend Solus.