While I agree that the music does not play often enough, I disagree with the OP about the quality of the new music composed for the game. A great deal of it sounds very Williams-esque and "Star Wars-y". There's a great deal of the original Saga music used in the class missions and many of the door missions, Flashpoints etc. I would like to see/hear more ambient music playing. Perhaps a travel music sequence while riding the flightpoint speeders or some ambient music while walking around the Fleet.
I'd also like to hear the Williams music in the space battle missions, mixed in with the new stuff. Hearing the Asteroid Field or the classic TIE Fighter Attack while dogfighting would be wonderful.