I'm surprised at the problems with the review unit. I just got mine this past Friday with a June 23rd build date and after performing all the updates I went straight to benchmarking and testing a few games, everything is performing as expected. I haven't looked at GPU wattage but the 3 performance modes are affecting framerates on the fly in a predictable manner.
In performance mode, Time Spy got 10,649 points, Time Spy Extreme 5,002, Port Royal 5,802. Unigine Heaven with my own custom preset got 109.7fps in performance mode and 93.3 in quiet, I'd not tested balanced.
The only issue I'm having so far is that the 780M is underperforming compared to another machine I have with a 680M. I don't know how much is to do with DDR5-5600 paired with the 780M vs LPDDR5-6400 on the 680M machine, or if it's an AMD driver problem seeing as they still don't offer anything newer than the pre-release version from May.