Winter!: Prepare for holiday gaming!
I must say, off all the Metal Gear Solid game this one is my most favorite. MGS games on PS1 and PS2 (haven't played the Guns of the Patriots on PS3) are more story based than they are in gameplay, but that's my opinion. In other MGS games you would spend a lot of time listening to details about government plots and other stuff that makes you yawn while listening. MGS Peace Walker however keeps the plot on need-to-know-basis.
The gameplay is mission-based, some missions are repetitive (get from point A to point B) but some are also creative (Pooyan missions) and challenging. You also get to have your own naval base which you expand by recruiting and kidnapping (yes, kidnapping, with a balloon) soldiers, make them develop weapons for you and you can also deploy soldiers in Outer OPs missions.
The real cherry on top is that you can make your own Metal Gear, from the scraps of other AI bosses that you encounter in the game.
So with summing and no subtractions, I give this game a clean 5/5 score.
Game Traits applied to Metal Gear Solid: Peace Walker (PSP) by Danijel