This is my worst match up. One of DDD's strengths is the continuous b-airing off the edge, but meta knight's forward b (the spinning drill to the side) when used as a recovery takes higher priority and makes this strategy useless. Meta knight's sword extends farther than most of DDD's aerials, giving him much more priority in the air. Once he starts juggling me in the air, it's hard to hit him. A defensive ground strategy involving throws works well but in the air it seems impossible. Meta knight is just smaller, faster, and has higher priority on a lot of moves.