Manjaro is #4 on Distrowatch as of this comment, while Arch is #27. Not saying that popularity is all that matters in a distro, but widespread adoption is really important in getting non-technical benefits such as funding, clout, and people willing to devote time to the project.
About the shadiness: every project takes or is inspired by other projects, none have come up in a vacuum. Even with the sketchy reputation, Manjaro seems to have the support needed to actually turn into a Linux winner in the long-term.
About the shadiness: every project takes or is inspired by other projects, none have come up in a vacuum. Even with the sketchy reputation, Manjaro seems to have the support needed to actually turn into a Linux winner in the long-term.