I am by no means a qualified expert on the post game but found an interesting analysis of GG post game from 1st 2 games..
http://tlorc.wordpress.com/2011/11/10/the-post-game-of-gods-gift-achiuwa/
I don't think he's always weak off the dribble as the analysis states. He's only weak at times with his back to the basket. There were quite a few times when facing up the hoop, he looked quite good off the dribble. His post moves might not be totally refined, but they are better than I expected. He's certainly not raw at all.