Mario Warfare = Mario shoots at stuff and things happen.
Mario Kart Theft = Mario is gansta, steals cars, and kills prostitutes.
Heavy Mario = A movie plays with Mario in it and you occasionally get to press a button.
Gears of Mario = Mario is a big, hulky badass that shoots at stuff and things happen.
Mario Gear Solid = A movie plays with Mario in it and you occasionally get to press a button. Mario can also get the "cardboard box" suit.