He's an excellent offensive center, which is why he was one of my favorite players from the 2011 draft. Ottawa was drafting 6th OA that year, IIRC I wanted Couturier first and then Scheifele second.
If team Canada was starving for offense in that tournament, I would have been the first to say that Cirelli (favorite for the Selke) instead of him was a huge miss
Finally, yes he's a liability defensively, that's what these metrics tell us. Among 417 forwards with at least 1000 5v5 minutes during these 3 years, he had the 396th highest expected goals against ratio...