Surely something that is worth having on a PSP
The system is design to be more like an army management system. Since it uses the MGS Portable Ops recruitment system but its been improved. You earn crew points based on how many people you have recruited and how you placed them by their specialty. The points also replenishes after each mission. Also send out your squad in outer ops to fight in war games and earn experience for your fellow comrades or lose them in the process also you can obtain vehicles and use them for your army which may give you an edge in outer ops.
Peace Walker doesn't have any difficulty setting so it is recommended to play with your friend since almost all missions in the game can be played in co op. A few Monster Hunter missions are also included in the game. Lastly you can also build your own Metal Gear using the components taken from an AI pod.
The Verdict:
Gameplay: Can be fun when played in multiplayer, but single player is still an option
Story: Good campaign but could have been longer.
Graphics: Ok for a PSP game.
Overall: 9/10