I’d say misunderstood is a wrong term. I’m pretty sure everyone understands it. Underappreciated, maybe, yes.
Also we have many of these threads already, pick your choice:
https://originaltrilogy.com/topic/ROTJ-is-the-best-Star-Wars-film-discuss/id/15430
https://originaltrilogy.com/topic/Opinion-Return-Of-The-Jedi-is-Very-Underrated-Do-You-Agree/id/79041
https://originaltrilogy.com/topic/Return-of-the-Jedi-Why-so-much-hate-What-do-you-guys-think-of-it/id/46205