To be fair, using old characters and concepts isn't the same thing as using them in-character or consistently. Certainly there are bound to be unfair or overwrought criticisms, but that doesn't categorize all of them.
To be clear, I'm not saying that you're making that claim. I don't think anyone here wants this run disparaged baselessly - I've defended Morrison's run, which Hickman's is closely compared to, and I'm fully aware of it's many faults.