you really think smashing pumpkins are underrated??
they seem to have a large enough fan base, idk, im not a huge fan of them. There can be some exceptions made for "Siamese Dream", it a pretty descent album.

Ide have to say the most undderrated band, prolly My Bloody Valentine. They totally changed (for me atleast) the deffinition of rock music. Showing me that its not about how fast yu can shred a guitar or how catchy your lyrics are. They showed me that its all about the music a whole. There instruments work together as a team, weaving in out of eachother, if you took out any one part of their song you would be left with nothing. Its such a shame how people immediatley dismiss this band because of the emo-esque name, when in reality this band is nothing NOTHING of "emo" band, old generation or new.
its called shoegaze