If you want a WWII game you can take with you,you'll definitely enjoy this.
The game is pretty straight forward in terms of story.You get to play as an American,a British soldier,and a Russian troop.The gun play is nothing special,but it's satisfying.As with any COD game,your given a secondary weapon,and its usually a pistol.There are segments of the game in which you'll mount a gun turret and shoot down some kamikazes before they crash into some ships,and you'll even get to ride a tank in Berlin.The game is a great shooter for the DS and I recommend getting it.
Multiplayer:
The online play is pretty fun.Its basically a watered down version of the console version,but it makes due just fine.There are only a handful of maps,but its fun regardless.When four players are united,two will have to join either the axis powers or the Allies.It doesn't really matter what side you choose,as long as you kill each other
Call of Duty:World at War for the DS is a probably one of the best shooters on the DS,and so if you like shooting the crap out of nazis,I highly recommend this.