It depends on how you want to look at it really. You could look at them as passing chords, but I dont think that's fair, since they are all treated equally in terms of duration. Harmonically it's one of their more complex songs, at least in my opinion. Some parts of it imply a harmonic minor sound (2nd chord has the maj7 of the A min scale) some imply dorian (the D/Gb chord has the major 6th of the A min scale,) and while you could look at these as passing chords, the very fact that the song is using passing chords makes it a bit more complex than a lot of their other songs (take straight up rock stuff like communication breakdown.) Whatever, it's not important, we agree on the main issue here, whichi s that stuff that lacks in complexity can be interesting.