The music was the best thing about this movie! An original, dark score would have made the movie a bit drab (which many people already think it is), and would have mirrored the emotions in too obvious a way.
If Taxi Driver, with its score, is "widely regarded as one of Scorsese's best films," that's just because the masses can wrap their brains around it and accept it moreso they can a more unhinged film (not that Taxi Driver isn't trippy!).
If nothing else, the eclectic and seemingly-mismatched music of "Bringing Out the Dead" matched the cinematography well, with its choppy editing, reverse-action sequences and blurred lighting,
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"Gentlemen, you can't fight in here! This is the War Room!"--Pres. Merkin Muffley