i have my own home theater, and one of my go to movies to show people how awesome it sounds is the scene in avatar where the main guy has to capture the dragon thing and fly it for the first time. it has amazing visuals and sound.
saving private ryan opening scene is also awesome, although there is one explosion that sounds weird. jurassic park also has pretty awesome sound and visuals. finding nemo is another. black hawk down, the last hour is a audio bliss. lone survivor also has amazing sound once the battle gets going. pacific rim also has amazing sound in general.
a lot of older movies like you are talking about, the sound simply is not that good in them. i'd never use an older movie to debut it due to just that, unless there was a recent remaster that fixed it.
but even older movies remastered, in my experience with what i've seen, the sound simply isn't good because the source was never as good i'm guessing. recent example i can think of is the remaster of the original robocop. the sound just isn't great by any means.