they are really not underrated, especially post-punk

try the sound - jeopardy if u want the classic gloomy post-punk sound
interpol - turn on the bright lights is pretty great post-punk revival with some upbeat and catchy songs
talking heads - fear of music (drugs is the last track) is less gloomy and has more groove than regular post-punk, but theres still a cold feeling to it. i prefer remain in light but thats hardly post-punk, except for the last song
everyone has listened to unknown pleasures already, but u might not have listened to closer which is pretty much just as good and essential

im not really into gothic rock yet so i cant say much