In many cases, I'd only ever heard the bands on vinyl or cassette and hearing them as mp3s I realised or remembered that the recordings were very bad quality indeed (eg Bob Tilton, Penknife... and Boy Sets Fire, This Crying...). That's likely to make it even less accessible. Also, I wish the recordings (for those two bands in particular) weren't so removed from the power of the bands live which can be so important for context. Another thing I realised is just how many of those songs have love song-type lyrics and not just the indie-type emo bands. Maybe that's unfair though - a lot of those songs are about raw emotions from relationships gone wrong and not in the 'please take me back' - type way you get from commercial music.
Discharge are playing London in December. I imagine that'll be an experience.