When you're looking for a few hours of zombie killing fun picking up Touch the Dead for the DS is the way to go.
The audio on this game is pretty good however the graphics are lacking for a game made in 2007 even with DS hardware. Metroid Prime Hunters is a prime example of standards DS players are looking for, not graphics with such low polygons that set this game back graphically when Doom was released. The game play is nothing more than shooting zombies to get to the end with some boss fights. Some players experience some reloading problems, I've seen this happen myself. The main problem here is when you try to reload to fast and you think you dragged your clip into your gun you release to soon or don't hold down on the touch screen through the sweep process.
I picked up a copy on release for $29.99 at Best Buy, to be honest I have only played it four times. Not that it's a bad game, but because there are so many better games to play on the DS for 2007. With a low price of $29.99 you really can't go wrong with this game if shooting zombies, and only shooting is appealing to you.