IMO, Game soundtracks are extremely important. Sure they're not as important as the gameplay. But it can ruin a good game or save a bad game.
BTW, what's all the fuss with Metal Gear Solid soundtracks. The only great soundtrack as a whole was the first PS1 game. The rest has a few excellent tracks but are pretty weak as a whole.
Anyway, here are a few underrated scores I enjoy.







