Quoted from o-din:
Very obscure and not many have heard of it.
Obscure? It was a staple of 80s re-runs after school and the DVD release (finally after years of legal maneuvering amongst multiple rights holders) was such a big deal it was a NYT story!
Quick, Robin, to the Blu-ray Box! ‘Batman,’ the 1960s TV Series, Returns in a Collection
Having said that, if someone who has only seen the recent movies watched the 60s show without already expecting it to be corny, they would be seriously disappointed! But that's part of the charm!