Since its launch late last year in Japan and early this year everywhere else, the PlayStation Vita has been looking for "a system seller" -- an exclusive title so good consumers would have no choice but to buy Sony's handheld. Assassin's Creed III: Liberation has the bullet points you'd expect to fill this void with the franchise's trademark gameplay and open world, but it's not enough to make it a must own. Liberation is good, but it's not great.Assassin's Creed III: Liberation casts us as Aveline, a young woman living in New Orleans before and during the American Revolution. When her mother -- a freed slave -- disappears, Aveline falls into the Assassins’ Brotherhood and starts stabbing Templars. If you're looking for a more detailed account of her journey from child to killer, you won't get it in Assassin's Creed III: Liberation, and that's one of its major flaws.Aveline is the first female lead for the franchise, and her internal struggle could make for an extremely interesting sto...