IME, a lot of of the so-called remastered versions sound poor when compared to the original vinyl versions. I think it might have to do with the fact that listeners now hear stuff on their iPhones etc., so the remastering is done to optimise the replay format.

However that said, some of the RVG (Rudy Van Gelder) remastering of Blue Note tapes for CD issue are excellent: the sheer sense of the performers presence is palpable.