Zidane is a underrated man manager. He enticed a nice calm brain in Pepe, and look how much better he got in heated moments during a match. The way he managed CR7 was great too at a time when Ronaldo wanted to play 90 minutes in every freaking match in every freaking competition. The link up play Benzema had with Ronaldo/Bale and the midfield was underrated too...Benzema really sacrificed a lot during that time and it shows how versatile he is, Zidane really appreciates him too.
Is he a tactical legend? Right now no, but he is a good coach and really knows how to work personalities imho. I think the current situation with Bale says a lot more about him rather than the coach.