Passion for the material is what defines a great movie.
I do not think there is a simple formula for making a great film of "passion". Passion defines some great films, and isn't much of a factor in other great films. It varies from film to film, and sometimes plain dumb luck also is a factor.
So you stylistically get the feel of a cave (High contrast, lots of shadows, "pools" of light, etc... ) without actually just making it have zero light.
I agree. There isn't a magic good movie button.
Film lighting isn't about just recreating the reality of a situation. A pitch black film that doesn't rely on the audience not being able to see anything (like horror movies) is a borring movie...
yet it seems to be the thing most geeks hated about it
This is utter nonsense. Lighting can certainly compliment or detract from a film, but it will never make or break a film. It's entirely possible to make a great film without a single exposed image, and it's entirely possible to make a terrible film with the most remarkable exposures ever captured.
(Pardon another divergence... aren't geeks a little bored with all these "dark" films? Why must every comic-book film be low-key? The presence of shadows does not automatically beget quality. My favourite thing about the Spiderman movies is that they willfully rejected that cliche', and yet it seems to be the thing most geeks hated about it.)
The thing I hated the most was emo-Spider Man.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.