This is one of my DS favorites. The amount of detail and intensity they put in this game always impresses me when I just pick it up to play for ten minutes or so to kill time. Planes flying over head, artillery exploding around you, the sounds are fantastic, and variety in levels is perfect. It's pretty short, but as a DS game its good for pick up and play, unlike MP:H or other shooters (although I love Metroid). I highly recommend this game, and now it should probably be only like twenty bucks.
Sorry I just wanted to express how much I like this game, and people out there looking for a DS shooter should try it.