I disagree with the, "it should have been in game x" comment only because I would rather them not try to las minute shoehorn something into a game and lose out on the game being a good experience.  For instance, a lot of the early (non-nintendo and even some nintendo) games were horrible because they were trying things without a clear idea of if it worked well or not.  it turned out most times it was "or not".  It took a while for them to get the clue that they shouldn't always just assume a game needs the motion gimmick...