For underrated 80’s bands, I have to go with the Blasters. Pretty simple rock n roll band, but they wrote a lot of great tunes, and they could play real American rock, rhythm & blues, country, boogie woogie, gospel, any of those styles like nobody’s business. The Stray Cats got the MTV rotation, because they had a pretty lead singer, but the Blasters did their schtick ten times better.
I'd pick The Smithereens.