This game is the prequel to Third Crisis and is a massive step up in terms of animation, music, and art with the addition of voice acting. From what I can tell, the stories are disconnected enough that you can play this game without being too confused by the worldbuilding. However, I personally recommend playing Third Crisis first (if you plan on playing it at all) for a better understanding of the worldbuilding and because it would be a bit disappointing to play afterwards if you had gotten used to the quality of the prequel.