The worst part is his saves %.
One thing i disagree with many people here is that it's acceptable to have a saves % lower than 900 because the defense is bad. Bad defense will allow more high danger scoring chances but also more shots. So if a bad defense allows 40 shots a game then the goalies can give 4 good goals on high danger scoring chances and still have a saves % of 900. If a defense is good it will allows less high danger scoring chances but also less shots. So if that defense allows 20 shots a game the goalie has no margin and just allowing 2 goals will result in a saves % of 900.
There's currently among the goalies with 7 games played a great total of 40 goalies with a better saves % than Primeau. Lot of them play for bad defense too. A saves % of 845 is simply not acceptable no matter how good or bad your defense is. It's simply not good enough for the NHL. Personally i would not be patient more than 3-4 other games such bad goaltending can defnitely have an impact on dev and Primeau is now old enough it's not worth being patient anymore.