I first saw Excalibur when it was in heavy rotation on HBO in the early Eighties, right when I was really getting into D&D, too. I loved it then, and I love it now, despite its flaws. The Wagner soundtrack is stirring, the cast is terrific (especially Nigel Terry growing before our eyes from a bumpkin to a king, Williamson’s sly Merlin and a very young, vivacious Helen Mirren as Morgana). The lush Irish countryside is a treat for the eye. I only wish they’d had more money for the climactic battle scene; instead, the armies (ha!) are lost in the fog.
I think it’s one of the great sf movies. We had an excellent discussion of it when it first came out: Arrival (seen it - open spoilers)
I very rarely give up on a movie, but I bailed on Moulin Rouge! after about 20 minutes. It was just a loud, frenetic, annoying mess.