People don't brag about Andersons boxing, his Muay Thai clinch is phenominal, as are his kicks and his boxing is ahead of most MMA fighters. It is not great by any stretch in comparison to pure boxers. He also has great Jits.
He said he is staying at middle now, not moving up.
Edgar and JDS are both better pure boxers than Anderson IMO. You just have to watch the video of Andy sparring at the wild card gym against a pretty average fighter to know how many fundamental boxing flaws he has. His fight he won at boxing looked decent, but he obviously has very average power, he simply derives his MMA punching power from small gloves and incredible accuracy.