Sometimes it's nice to blast zombies from afar. In Call of Mini: Last Stand, you assume the role of a sniper (or rocket launcher-er, if you've earned enough cash) perched safely above the fray.
The game is more about precision than reflexes. Your ability to land head shots will determine your chances of extended survival. When hordes of zombies are funneling towards your base, hurling bullets at their feet won't do a whole lot of good.
Occasionally you're supposed to protect survivors from a zombie assault, but we say every man for himself. That's what civilians get for entering the zombie apocalypse unarmed.