I actually understand where all your complaints are coming from, but I don't find most of them a problem myself. There is a minority of older music where the production quality can get in the way of me enjoying it (this is the case with some King Crimson and the live swing/early jazz I've heard), but most of the time, that "vintage" sound is better to me than how I imagine the music might sound were it rerecorded. If you took a Sabbath song and got people to play every instrument tomorrow exactly as it was played on the album, I would still prefer the originals.
A lot of modern music with completely up-to-date production, despite all the clarity in the world, sounds terribly flat, plastic and glossy, like you're listening to one polished layer of sound that only covers the surface of a great possible depth. Older production was about recording natural sounds; modern production often seems to be about recording sounds, running them through software, and ridding them of their natural qualities, because for some reason, those natural qualities are now undesirable. For example, compare the drum sound on Led Zeppelin IV to Systematic Chaos, and tell me which one sounds more like a drumkit.
This probably doesn't help you at all, but listen to some jazz studio albums from even as early as the mid '50s. Crystal clear production. Having said that, we're talking about acoustic music there, which makes a huge difference, unless I'm mistaken.