its a damned if you do, damned if you don't argument. Absolutely testing gaming in a CPU limited situation gives a much better like for like comparison one CPU to the other. But its also true that most people actually game in a GPU limited situation.
Honestly I think people are putting too much stock on certain numbers in order to "prove their point" rather than looking at the situation as a whole. From what we've seen the 7700k does give you a higher maximum FPS in gaming. The various ryzens give you much better performance in non gaming high threaded applications. In most cases giving near 6900k performance.
I honestly believe that background tweaking will allow for a small performance boost to Ryzen in the coming months, but I don't think it will ever really be a match in gaming for the 7700k, at least until we see games designed from the ground up to make use of the ryzens number of cores. But I also think that in most cases the ryzen provides pretty good gaming performance. So it comes down to a choice, if you just want to game, stick to intel, if you want to do other stuff as well get amd.
What I've seen has been more positive than negative in terms of what AMD have achieved. And I hope it leads to continued competitiveness