The translation work isn't much if any worse than the original at all. The music isn't worse, it's just different, softer tone in general, some songs aren't as catchy, others are significantly moreso.
It seems like the game is harder though, more variables, more punishing to guesswork. Health system sometimes makes it more friendly, but since it's depleted/brought into use more often than the marks were and you cannot refill it outside of psyche-locks, it's probably a little tougher in that regard too, really.
Scenario design is a lot more grueling, right off the bat, far more interesting too, IMO. Fantastic game, really, really hope they decide to do PW3 also before the DS specific one comes out