Stewart is guy who's destined to be underappreciated.
I don't think he has the skills to create a lot of scoring on his own, which will hurt him. However, he's as strong and fast as anyone and that will make him valuable. He will force early an innaccurate passes with his hitting, dig pucks out of the corners, and be able to plant himself in front of the net. Stewart won't be a guy who beats NHL defencemen 1 on 1 with any regularity. However, if he's put with skill players he could put 60 point up. But like I said, his contributions will be underrated because his physicial skills will create unmeasurable (physical play causing intimidation, injury/fatigue, momentum swings, etc.) advantages for his team.