the creative IS a good card, i've only heard good things about it.
altough, i dont excpect it to be as good as a PCI card in a normal pc.
but.. what does the sound actually sound like?
does it sound like youre in a hollow tree? or does it echo or what?
usually there is a Equolizer in the sorftware of a soundcard, maybe check that out, because you can alter the volume of different frequenty ranges with it, so you can alter the sound quite a lot with something like that.
( at least, My creative card has a software equolizer with it
)