Ken McKown writes: The Vita has been out long enough now for me to proclaim that I love that system. Its screen is gorgeous, and the amount of content coming to it lately has really invigorated my interest in it as a platform. That said, I wish Sony would stop trying to legitimize the machine by proving it can handle a solid FPS. Resistance failed to prove it, Call of Duty failed to prove it and now Killzone does little to enforce the idea that the Vita needs this genre to thrive. Mercenary is yet another disappointing attempt to bring the genre to this portable device.