NES: Super Mario Bros
An amazing soundtrack. It's so simple and clear, and yet in Bowser's Castle's theme you sometimes don't know what's going on.

I don't know what to say on this. I've heard this soundtrack so many times I definitely can't give you a first impression. But oh, is it good.
SNES: Super Metroid
Pretty good! It certainly is atmospheric, like Metroid. Not anything too special, though, I thought. Especially not when compared to the original Metroid soundtrack, which was spectacular.
N64: Ocarina
This soundtrack is very good. It's also got quite a special feeling to me, even though I've never played the game. The Hyrule Field theme is amazing. It's so long, too, and features a lot of different themes! I also really like the Potion Shop theme. And some other themes are remarkably eerie!
I hadn't heard the staff roll theme before.

Gamecube: Wind Waker
Another great soundtrack. What really got to me is how many tracks convey the location they're used in. When you hear the Departure theme, it actually sounds like you're on a ship. I automatically start moving my head from left to right and back.

You can also clearly hear that it's not a cruise ship you're on! My reaction to the Great Sea theme: "Oooooh!!! I don't think I need to explain why this is so great.

But I can try.

It really expresses the vastness of the ocean, and the sense of adventure.

And of course the beginning arpeggios picture the waves of the sea!" And then the Dragon Roost Island theme really feels mountainous! Perhaps because of the instrumentation?
I was also particularly impressed by Molgera's theme. That's so cool! And 'Farewell Hyrule King' was very interesting as well.
Wii: Super Paper Mario (Floro Caverns/Sammer's Kingdom) Regardless of opinion on the game, I always though Brawl had some really good tracks too.
I hadn't ever heard this soundtrack before, and it was much better than I expected! The music sounds a lot like The Thousand Year Door, but it's certainly still very unique. I was surprised to see that both games did have different composers!
GBA: Superstar Saga (Hoohoo Village ftw)
I've actually been playing Superstar Saga again. It's my second favourite GBA game, and also in my top 3 GBA soundtracks (not counting remakes/ports; my favourite GBA game
is a remake/port, namely Yoshi's Island).
Cackletta's Theme is clearly my favourite. I'm hoping to play it on organ some day, but I've only played organ twice in my life, so I'll need some more experience first, I reckon.

Other favourites are Beanbean Castle, Prince Peasley's theme, Gwarhar Lagoon, and Teehee Valley (panflute is always nice

). I also feel like E. Gadd's theme perfectly 'captures the spirit' of professor E. Gadd. Bowser's Castle's theme is unique when compared to other interpretations throughout the Mario series, and I really like that. Especially because it does still get the atmosphere right. Oh, and I should mention the credits sequence. It's probably the most comforting credits theme I know. And that's really welcome, after such a journey.

It's not extremely emotional or intense or upbeat like credits themes for other games, and that's nice, as that's not what you need at this point.

What you need is a theme to lay back to, and
relax.