Eh, Halo music gets kind of repetative after a while, especially when you don't have the game action to help you ignore it during the lulls.
As far as Portal goes, the ending song is great, but the music is otherwise nothing to talk about.
Enough criticizing, now to let you ridicule me. I have been a fan of several Kirby and Metroid soundtracks, as well as a lot of Megaman songs.
Also, while the music is not the best, I like how most of the tracks in SSBB were remixed enough to be fresh while still reminding you of the originals.