Benzema has been great for Madrid this year. Not only in terms of goals and assists but the amount of selfless work he does for the team in terms of pressing, tracking back, making runs to drag defenders out of position, holding the ball up with his back to goal and dropping deep and moving out wide to play one-twos to put others through on goal has been so invaluable and he really is the perfect fit for Madrid. When you have two players like Bale and Ronaldo who eat, drink and breath goals and like to get in behind the opposition backline, there are few better players to have than Benzema. He links up so well with other players like Ronaldo, Bale, Isco etc.
If he took penalties his goal numbers would be even better and his goals per game record is really impressive, especially when you take into account that he is not the teams 1st goalscorer and is sometimes not even the teams second goalscorer like when Higuain was around and Benzema had to be played out on the right to accommodate him as well as now with Bale in the team where he has to drop deep while Bale advances forward.