To have an empty title or fame without the actual ability or reality to back it up; to be nowhere near as good as one is made out to be.

Puny or insignificant fame; literally meaning fame as small as the horns of a snail.

to possess a reputation or title that one does not actually deserve

To possess a hollow or false reputation that does not match reality; to have fame without the actual ability or merit to back it up.

To enjoy fame or a good reputation without having the actual skills or achievements to back it up.