We are so used to see 1st overalls and great young guys come in the NHL and have success right away that we forget it's actually normal to take a few years to really come into his own in the NHL. Let's give him some more time before talking about bust territory.
With that being said, I think the Habs have rushed him because of the 1st Overall tag and also because he played with men before (Olympics, world championships and liiga). He should've spent a year in the AHL, especially after his injury, but that's just my opinion.