I believe WDADU is the most 'disrespected,' I guess. As someone stated, it's often judged for things like it's production and Charlie's vocals when most of the music is just downright phenomenal. All the other albums seem to have stronger and ademate 'defenders,' if you will. Who knows, though? That's just the perspective of some random forum user (me).
Off topic-ish
Since yall are talking about SC, it has several songs I love putting on every now and then. For example, ITPOE (both parts), TMOLS, Repentance, and TDEN.
Kind of unrelated, but as a guitar player, I believe I have an interesting take on why I have such an easy time enjoying everything DT does. I just enjoy learning it all. All their songs almost represent a dot on the timeline of my guitar skill progression.