I don't know if I'd say it's "the most underrated album of all time" though. Usually it just gets ignored or mildly liked rather than given bad ratings (which is what I'd think an album would need to be considered that).
I suppose I'd take it over Dylan, sure. but they're about as far apart stylistically as you can possibly be while still using predominantly acoustic guitar. So I don't think it's all that good of a comparison.