Although there is no formal quality control, people do make use of the cpan ratings to voice their opinion.

My advice is to run your stuff by other people before uploading, if you're not sure. Choosing the wrong module name will get you grief from others. Some people don't read the pause docs and use non-descriptive top-level namespaces (e.g. Water !?) or create a namespace for their cpanid (e.g. DPCHRIST).

And instead of just reading docs to figure out the conventions, choose a few respected, and recently updated, modules to crib from.