Wiggins is not the most creative or versatile scorer in the draft.
He is a poor finisher at the rim.
Many of his inside baskets came off lobs and putbacks, and his jumpers were often wide open because defenders played off of him.
Did you watch his games, or just look at this chart?
With that said, I have hope that he will improve in these areas (+ball-handling) and become more of a Paul George than a Kawhi Leonard. If he can do that and learn to make his teammates better by improving his passing ability and court awareness, he will be superstar. I'm not counting on that though.