Life time worst is a hard question to answer, but my most recent bad game for me was Bionicle Heroes on 360. The game is ugly and the over-the-shoulder view is horrible (I don't know what it is because Gears of War did it just fine). Your character bounces around as you walk making it hard to target things and you have to be in an exact position to activate or build anything. A quarter of an hour into the game I gave up.