I speak Marathi, but haven't ever lived in Maharashtra. In Hindi, it wasn't uncommon to hear "ek number ka ...", but to me the context was always a negging directed at the audacity of the joker, and never as a rating of the joke itself. I also haven't heard anybody use "ek number .." in Hindi in any form in a very long time. It's possible the phrase evolved different contexts and implications in the two languages.