What do ducks fans say he is? I think Cam is a #2-4 Dman. He would be a good #2 to a true #1 Dman (franchise type) or a very good 2nd paring guy. I think Vatanen is a 2nd paring guy with slightly better offensive gifts, but slightly worse defensively. Value wise I think they are close, with Cam being the slightly better player, but Vatanen signed to a longer term.
His play fluctuates between a 2-3 guy. No more, no less, and more importantly, no need for an advanced stats ideology to tell you otherwise. There are flaws in his game. There are flaws in hockey analytics.