It wasn't completely finished, and even with the third patch (or is it fourth now?), there were still things waiting for improvement. You couldn't set it to spawn monsters anything more than rarely, or else you'd literally spend all your time in battle... 'cause while you're fighting one critter, the next one would be lining up to take a shot at you!
I enjoyed it for what it was, and played it a couple of times. It just doesn't have the staying power of W&W or the old MM series, or even BG.
I still see it in the stores for almost full price, however... go figure