I don't think Brown will ever be demonstrate the pure offensive skills of a Kyrie or Tatum, but you can see how hard he's worked to become very effective on both ends of the floor. He has shown the ability to consistently knock down that corner 3, hit that MJ mid-range post-fadeaway, and drive to the basket at will (on the break or in the half-court). Those are three high level skills that should allow him to continue to be very effective moving forward in his career. And this isn't even taking into account his defense.
Brown has a unique ability to take over a game in spurts when he isn't even one of the go-to players on the floor. He would be an incredible '5th guy' in an AD/Horford/Hayward/Brown/Kyrie line-up.