Wiggins, despite his inconsistency, is the complete package. He has the potential to be great on both ends of the court...he's also the only player in the draft that can really say that.
Parker is excellent on offense, below-average on defense.
Gordon is excellent on defense, below-average on offense.
Randle is quite good on offense, below-average on defense.
Embiid is a game changer on defense, and his offense is ok. Embiid has the best chance after Wiggins at being able to positively affect both ends of the court.
It seems like Exum also has a chance at being a good player on both sides, but it's hard to say considering the competition that he has played.
Every top player has some concerns, so it really just comes down to who fits your team the best and what style you want to play. It's also difficult for us as fans, because we don't know who our coach will be or what style we will play. I think that pairing Parker with an effective post defender could work. I think pairing Gordon with a real stretch 4 could work. Wiggins and Embiid will work with anybody, Randle needs a quality post defender to pair with him. It will be easier to say once we know where we're picking.