I really think "it's 90% rider and 10% machine" is a big exaggeration in MotoGP. Even Marquez is not going to win a race on a current generation Aprilia, and I'm not sure there is anyone other than Marquez who can win races on the current Honda.

edit: regardless, Dorna has done a great job making MotoGP competitive and MotoGP has to be at or very near the top of the list for the best racing on the planet.