The problem is that you think anyone is saying Puljujarvi is good.
What is being said is that he’s better than some of the guys who have been staples in the bottom 6, which is probably true. It doesn’t mean Puljujarvi is good, it means they are worse.
It is also true that Sullivan has been much more critical to guys like Puljujarvi and Puustinen when they make a mistake like taking a penalty or a missed coverage that results in a goal against. Acciari literally handed the game over on a silver platter with a bad giveaway a few weeks ago and never missed a shift.
Both things can be true that Puljujarvi is not a good player and Sullivan is a crappy coach who plays favorites, most notably for guys that just so happen to have been born, or played college, within a 100 mile radius of Boston.