Most underated albums......

Phasecorrect every single one of your list has been critically lauded and are very well known in the alternative world.
They may be obscure to the mainstream/average music fan but they've certainly never been underrated.
Sorry for raining on your parade but Audiogon is creaking at the seams with misread replies and countless suggestions that don't fit the description either in country of origin,timescale or whatever.