You've never experienced online dungeon-crawling like this before. That goes double for all you non-PC gamers out there. Just stay away from single-player mode. What a way for the DC to go out with a bang. Sound effects are predictably adequate.
Camera is a bit on the wild side as well.
Overall Be prepared to be sucked into a world from which you may never return. Problems aside, Phantasy Star Online is an addictive gaming experience unlike any other.