Mario Götze is the biggest talent of the current German generation, which means a lot given the amount of talent we have.
Taking his age into account, he is in some departments heads and shoulders above his competition. His close control on the ball is pretty much unrivaled with only Özil coming close.
The points, which justified most of the hype around him for me were his consistency and maturity on the pitch. At the age of 19 he put a struggling Dortmund side on his shoulders and carried them for around a dozen games, which later became the start of an incredible series for them. At that time it became appearant that he was the real deal and could become a candidate for the Ball d´or some day.
If he can fulfill his extreme potential still remains to be seen and mostly depends on two things:
The first and more obvious one will be his injuries. For such a short career, he already suffered from a lot of injuries and he needs to hope to not turn out to be extremely injury prone.
The second will be the question, how he will handle the medial attention of his person. One of the biggest differences between Bayern and Dortmund is still the amount of attention the players receive. Dortmund may have caught up there, but Munich still remains the main focus of the medial eye in Germany. The officials of Dortmund, especially Klopp, also make an active afford to shield the players from too much praise or criticism and try to develop them in a calm enviroment. This would be to such an extent not even possible in Munich.
I still think that the point in time (the destination was logical) of the transfer was not well chosen by Götze. For me he would have benifited more from one or two additional seasons under Klopp at Dortmund before moving on. Even if he would have stagnated on his current level, he would still be a prime target of all European top clubs at the age of 22 or 23, so the risk was very slim for him. But in the end Götze had a different opinion in that matter.