There aren't many "bad" Ross courses still around that Ross - if he reappeared among us - would recognize as a course he designed.
A lot of his low budget, mediocre courses were designed for smaller towns or clubs. These tended to be the projects where he mailed-in his drawings. Many of those courses are now either NLE, remodeled or neglected beyond recognition.
Lots of Ross's more mediocre designs went the way of Ponce de Leon. It was not an especially good course. Partly for that reason it was hard to generate a lot of support to save it. Thus it was sold to a developer and is now NLE.
A better question is:
How many Ross courses are around that, if restored (using some reasonably informed architect), would still be bad courses?
I suspect not many.
Bob