I have posted in other threads what I think about Kyrgios and won't repeat here. One place is
this.
Given that he is young and his game is evolving, with time assessments might need to change. His ground strokes are better today than two years ago.
I really think this motivation talk is almost complete garbage, his results against the big three are first consequence of the fact that most people chose to ignore that he is a big server, and also of the peculiar points in time where he faced them. Not to mention the obvious, glaring fact that due to age alone most young players have a better H2H against the big guys than the rest of the field. Up to this week Borna Coric was 4-4 against Fedal, nobody kept repeating that every day.
Kyrgios game plan is to grind. Grinders put the ball deep. It is a percentage shot every time and you simple don't plan or aim each shot. But he is smart, goes for the unconventional now and then, has basically zero fear of missing and that constitutes an effective combo. Obviously he is a good player -- as everyone that breaks in the top 20 is. He will win tournaments. That was a quality win, for sure, congratulations to him. But still, big server winning on a fast court in a lot of tie-breaks.
The only "correction" I can commit too -- one I did quite a while ago but will repeat here one more time -- is that at first I simply said he was "untalented" and later corrected to something like "with specific (and peculiar) talents", as my gut reaction to the word "talent" is to think about ability/technique. When I think of "talent", I think of guys like Fognini or Checinatto. But, ok, that is a narrow definition of talent, and I gave up that point long ago.