I still thought the BD sound was better than what I heard in theaters. The theater sound didn’t have enough bass, punch, or impact. The star wars theme in the opening crawl didn’t have near the impact I remember it having when I saw ROTS in the same theater. Although it is possible the speakers haven’t been maintained well.
Well, I for one thought the theme sounded kinda weak both in the theater, on the soundtrack CD and on the BD. I think it’s just a matter of the performance itself lacking intensity.
Though I agree with your point about dialogue volume. I tend to find in live action movies (animated films rarely have this issue) that I have to put the subtitles for the hard of hearing on, simply because the dialogue is often drowned out by the sound-effects. And for what it’s worth, I did not have this problem in TFA.