I like My Life with the Thrill Kill Kult. They never seemed to go mainstream. Their music is Industrial, but instead of having a rock beat under it, it's more of a Disco sound, yet still classifies as Industrial. The Satanic messages are pretty awesome too. TKK is also significant as being one of the first artists to sign to Chicago's iconic Wax Trax label, which pioneered the Industrial sound of the 1990's.
Anyone else have Underrated Industrial Bands to share?
Pics are a few select covers of their records.