That is an interesting question you bring up there... I think there are some songs (obvious example = Only Skin) which people always seem to love because of the song's sheer power and epicness, but one interesting aspect of HOOM is that there seems to be quite massive differences in opinion regarding some tracks which I suppose could be classified as "less immediately fav-material" but some people still always seem to absolutely adore (same goes for earlier stuff as well, I guess).
I think for me, for various reasons, something can just suddenly trigger or spark adoration for a song. This was the case for No Provenance, suddenly I just loved it. I guess personal experiences, opinions and references come into play in how much we identify and love each track and album every time we hear something, so any clear cut classification will be difficult to obtain I think, but would be interesting to explore, anyway!
I am also guilty of not putting my love on Autumn to begin with, and can even throw Esme and Ribbon Bows in there (though I absolutely adore Esme now). Autumn and Ribbon Bows are growing on me, but probably are on the bottom of the ladder on hoom (not that that's a bad place to be!)
I think disc three occasionally suffers a little being at the very end of a pretty long album..
Oh, and I'm glad to be here