sux2bu. Super Metroid STILL holds its own in EVERY aspect...gameplay, music, and surprisingly enough graphics. There's something about well-executed, colorful sprites that will never be beaten.
Of course, for something similar and almost as good, Metroid Zero Mission for GBA is very very worth it.
Yeah, I'm going to pick Zero Mission up in a couple of months (I have MP2 soon). What I'd really love is for them to release a gba double game cartridge with Super Metroid and Metroid 2 (only with colour). I think there is a market for it. I'd grab it straight away.