Ok when its the only good multiplayer launch title but after that its just a below average FPS.
User Rating: 7.8 | Perfect Dark Zero X360
At first I thought Rare could revive their former spot as FPS champ, but it seems all of that talent went to Free Radical. Perfect Dark 0's single player is short and lacks a good story. The AI is **** it can get challenging on harder difficulties but only because it sends countless numbers of people to attack you that spawn next to you (the AI never really gets smarter). PDZ has its good part, in multiplayer. Its full of varied weapons, game types, and 32 people online and that will last you a good amount of time, my personal favorite is Infection. PDZ needs more characters and levels to choose from, but that can be fix from downloads online. PDZ does not bring to X360 what PD did to N64, it does not even beat most shooters out now... its an average shooter, that could have been a whole lot better. 
