The re-recording of “ancient” scores is a case by case thing for me. I have a copy of the original score of Steiner’s SHE (released by BYU/FMA I think). But the Morgan/Stromberg re-recording on Tribute (again, I think) was like a breath of fresh air.
But the re-recording of KING OF KINGS (a release I supported) is one that I haven’t listened to all the way through. Despite the lower quality sound (though it’s not bad) the original is just so much more vibrant in the playing. And I could say the same for the CONAN re-recordings.