Star Ocean 1 is for the Super Famicon only. You can probably download the ROM if you get a good patch. That is something that has eluded me for a few years now.

Star Ocean 2: The Second Story, is considered the best, and it was released on the Playstation back around 97 or 98.

Star Ocean: Blue Sphere is a sequel to the Second Story, and was released on the Game Boy Color. However, due to the large amount of dialogue barely fitting with japanese characters, Tri Ace/Enix never could port the game out of Japan.

As far as SO3 goes, it is my favorite next generation RPG. It has a great balance of gameplay, and wonderful existential story. Very challenging sidequests, and superbosses that are actually super. None of those "beat the game, train for 3 more hours and then whoop the superboss" shenanigans from games like Final Fantasy V.

Music is so/so. Although Tri Ace carries over the best tracks from Valkyrie Profile and Star Ocean II to serve as awesome secret boss music, nothing incredibly great is in the original score for the game aside from maybe a boss track that plays once and the final boss track.

Overall, I'd give this game somewhere in the neighborhood of a 8.85 - 9.25. I really enjoyed it.

I'm a bit biased towards this series and SaGa in particular, so whatever acclaim I give any game in these series should probably be toned down a notch or two for an accurate reflection.