I've realised why I hate Tabs efforts in marking contests so much. He grapples with his own man regardless of how many opposition players are in the contest and ignores everything else, normally allowing a third man in an easy mark. He never alters this or tries to compete and bring the ball to ground, conceding it's not his problem if there's a third man up. He just allows the simple mark instead of finding a way to get involved, not lock in with his opponent or at least drag his opponent to the drop of the ball and spoil.
At best it's selfish.