I was reading a thread on here the other day about this. Of course we would all complain if Em made direct replicas of his old albums. He keeps on reinventing himself exponentially and is doing things he's never done before. He sounded super human in Rap God. It was godly, like he was a super alien or on rap steroids. We would never get this kind of new flow if he didn't keep reinventing himself.
Make no mistake. He has to keep innovating and it has to be met to standards. Quality is still key. But the more he's able to reinvent himself, the more new stuff we'll get. The key is getting bits and pieces of his old stuff and bringing in the new stuff to meet it.