Just received the disc and popped it in. Make sure to listen to the Atmos track, even when only listening on a 5.1 system like myself.
The 5.1 is pretty underwhelming, thought something was wrong with my setup and immediately checked speaker levels. Everything was as it's supposed to be, so I switched to the Atmos track and... wow! It all opened up and there it was, the surround listening experience I expected this release to be.
I don't know what went wrong, but better keep your hands off the dedicated 5.1 mix.
Ok, back to listening...