I was really looking forward to Fat Princess on the PSN. Unfortunately, having bought and played it, I consider it one of the biggest letdowns of 2009. The gameplay is simple and straightforward, but the key to success is teamwork. For a game that relies so heavily on teamwork, you really can't find it on the PSN. I suppose this can be attributed to the PSN's poor matchmaking and high % of players without a headset.
I really can't recommend the game for a platform that offers an even worse online experience. I guarantee bot matches will be fun for the first 30 minutes and extremely repetitive thereafter.