Developed by PlatinumGames (yes, the people who made Bayonetta!), this fast-paced third person shooter let gamers assume the role of Sam Gideon, a DARPA agent with a slight resemblance to Solid Snake.
The gameplay was centered around Sam's Augmented Reaction Suit (ARS) which allowed for interesting gameplay mechanics. Sam's suit could slow down time to allow for extra time to kill enemies, boost him quickly across the battlefield, and incorporate different types of weaponry. The game's innovative mechanics awarded it high praise from critics.
So what happened?
Although its sales were not as disappointing as other titles on the list, Vanquish simply became overlooked by gamers. PlatinumGames' other title, Bayonetta, overshadows this innovative and fast-paced shooter. However, Vanquish was released alongside Fallout: New Vegas which could have allowed for it to fall off of gamers' radar.
Image source: Euro Gamer