Sounds bad, a chunky mess of sounds. For the strings, increase the attack and release; for the woodwinds and brass, do the same thing but to a lesser extent. Doing this will produce much smoother sounds.
Needs more bass; the 16 to 300 Hz range is practically empty. Your sounds should be spread out more like this. Don't go too high, though!
Definitely much better than some of the other music I've heard on DC. Also what you've done with a midi is great; you can't expect rich quality from a midi. Good job