Just musing as I watch it. It never really appears on lists of musicals or CDs etc.
It has some very singable tunes: most people know the title song, a nice love song, a big ballad, and I'm noticing that the underscoring is really good. The storyline has a nice bit of drama etc.
Is it a bit of snobbishness? That it was almost a jukebox musical for teens, but by the band themselves?
I know it was never on stage, but arguably Grease and Annie (as examples) became more popular from the films. The other thing I've thought of is that it's a bit dated, which it is, but it's not the only one, and I'd have thought the music would have stood above that.