Perfect Dark Zero was arguably the best launch title the 360 had.
The first thing you may notice when you begin the game are the intense graphics, topping any Xbox one title. But beyond the graphics lies a great first person shooter with much replay value due to the interesting cover and roll tactics, the large amount of weapons ranging from the simple pistol to the Hawk Boomerang and the halo-esque Plasma Rifle, etc.
But the game does have some faults, one would have to be the AI system that makes the enemy have the skill of a band of toddlers. Another being the subpar vehicles.
But despite a couple problems here and there, the game has replay value with it's achievements, unlockable weapons, unlockable difficulty levels, etc.
And the multiplayer is pretty fun, easy to unlock achievements, and bots so you don't have to play with yourself...eww.
So I recommend this game if you are just picking up a 360 and want an FPS to kick off. 8.9 out of 10, it's a good buy.