I mean, the lyrics to Under A Glass Moon sound nice, but they're basically just gibberish. The same could be said for Metropolis, really. The only reason we know what it's about is because the band told us.
To clarify, I don't think that lyrics actually have to mean anything to be good. But it does bother me when these sort of "nonsense" lyrics are regarded as great. But, that's just my opinion.
I just wanted to chime in as someone who tends to
adore 'nonsense' lyrics. I treasure anything that inspires my imagination and puts me in a creative mood, and lyrics like those of Metropolis and Under a Glass Moon do exactly that for me. They have a dream-like quality that fills me with creative energy and takes my mind places it wouldn't go on its own. And that, to me, is an absolutely beautiful thing.
That's not to say that these types of lyrics are inherently superior to other styles, of course. There's a lot to be said for more straight-forward lyrics, and lyrics with deeper meanings are wonderful. But 'nonsense' lyrics can be great, too.
Anyway, sorry for the tangent. Just wanted to provide a counterpoint.