Yeah he is top 5 for me as well. Only Deron Williams and Chris Paul rank higher. I think he is on par with Rondo.
Like you said, the offense is pretty poor for the most part. He literally has to make a play 90% of the trips up the floor for them to score. Either a jumper, driving to the lane to score or kick, or by making a nice pass.
As for his speed, it is very impressive on TV. When you are 5 feet from him and seeing him get end to end, it is a whole 'nother level. Put it this way, he was so impressive last night Laker fans were cheering for him when he would score.