Thanks for sharing that post. It echoed many of the thoughts I'd had about the game. The sheer genius of Metroid 2 is how well it juxtaposes the ruins of a lost civilization with the sheer alien horror of the "jungle" that is taking over. The music and sounds don't just complement that, they play a starring role in the creation of that tension.
Metroid 2 is relatively forgotten compared to Metroid and Super Metroid, but its graphics and sound build up a sense of tension and uneasiness in a way that they don’t match, I think. This blog post articulates my feelings on the music of Metroid 2 pretty well: http://www.jonas-kyratzes.net/2007/03/15/the-music-of-metroi...