A couple of things which haven't been mentioned yet, but without which VvD might be more vulnerable than he is despite such a comprehensive skill set, are his willingness and ability (one doesn't always see both in a player) to mix it when he has to. Strikers who try and muscle him into submission soon learn the error of their ways.
To think Klopp and the club were being slated by some on here for not pursuing alternatives when the deal hit trouble....