I have always felt that he was overrated for his offensive upside. I mean, look at his numbers in the SHL: they're decent for a player as young as him, but when you compare them to the numbers put up by other highly rated Swede forward prospects over the years his numbers don't stand out. He has always looked good in international competition against his peers, so that's a good sign. And his AHL numbers this year are good. I just think he was overrated this summer by people thinking his PPG in the NHL from last season would carry over to more games this season.
What you're hoping for is something like M. Koivu, but I don't see him reaching the offensive numbers Koivu did. IMO you're hoping (i.e. upside) for a 50-60 point guy when all is said and done, which are solid numbers in today's NHL. More likely a 40-50 guy, as early as 2019-20 (or if Koivu or Staal are gone, possibly earlier).