Unless I am mistaken, given two attacks, it is always better (for the fighter) to attack twice than (try to) shove a target prone and attack it once with advantage. Standing up from prone consumes half of ones movement. Therefore, standing up is kind of moving, and movement does provoke attack of opportunity within the threatened area otherwise. If the prone target chooses the stand up, the fighter would kind of get his/her second attack back (with advantage!). Is this even overpowered? I am trying to make this option more worthwhile and more commonly used.