In short, a good multi player game, single player lacks. Worth the money just to play split-screen.
It is addictive and simple. there is nothing complicated about it, and you can play for a long time without anything really easy or hard. It is worth owning if you have the money and can find it. I do wish they would have made the graphics a bit better for episode one and the music is not the best. I also wish they would have put more cool weapons into it, but I havn't got past Hard difficulty yet either. I have put a good 75 hours into the game and have made it to level 47. I don't actually know the maximum level, but I heard that it is 200! So I don't plan on being done anytime soon. If your looking for a good, long, simple game, you find anything better than Phantasy Star Online Episode I & II. It is probably one of the better games you could get for your poor old Gamecube.