Bought 3300 last week. Haven't watched too many movies so far, but heard a lot of audio CD (Hindi, Kannada film songs), DVD-Audio, and FM. From my experience so far, I can say music sound quality is pretty decent/good for the speakers it comes bundled with. I will consider replacing the front speakers with the better speakers sometime in future, but for now they are okay for me for my audio CDs (that's my take).
Having said that, I must say I basically bought this system for music, not movies. If you are not a big fan of watching movies on DVDs/BDs, then you may consider other 2.1 systems rather than this one since this is basically designed for movies. If you still want to get this one, then you may want to try replace the front speakers for better music.