How to make a (hopefully silk) purse out of a sow's ear...
I realize this is a response to an old post, but I wanted to address this particular point. If there is enough left to work with, then it is sometimes possible to restore some semblance of listenability to the poorly produced recordings. All is not lost.
For those who aren't opposed to a little home remastering, have a look at this
website. I would encourage folks to give this approach a try.