Even though the PlayStation Vita is a 19 months into its life cycle, fans of the FPS genre haven’t had much to crow about. Developer Nihilistic created Resistance: Burning Skies, the very first twin-stick FPS title for the Vita but set the bar lower than a snake’s belly. Embarrassingly, the very same developer put in another uninspired effort towards the end of 2012 to produce one of the worst titles in the popular Call of Duty franchise: Black Ops Declassified. Roll on September 2013, and Killzone: Mercenary tries to impress the masses that have long given up on a solid FPS on their portable games console. Is third time the charm, could this be the “killer app” Vita users have been waiting for? Find out after the jump.