One thought that came to mind-- while obviously he needs to consistently play better, the expectations people have for Pettersson seem a bit odd to me. From the way people talk, it's like they're thinking "He makes 11.6 million, therefore he needs to take the bull by the horns and complete take over games and dominate," but even in his peak 100+ point Selke-worthy season (which is what warranted that contract), since his initial major injuries forced him to change the way he played, he's never really been the type of player to "take over games" even at the best of times. At his best, he was still more of a "quietly do the right things all over the ice and make enough clever/subtle offensive plays that he somehow ends up with 3-5 points" kind of guy.
This game... pretty much looked like that, in my opinion. He could have easily had 2-3 points and was great defensively. Just need to see it consistently.