I got 2 things that lessen his greatness in my eyes.

1. The lack of tarmac drivers during his 9 tittles. he always had those 3 or 4 tarmac rallies, since there was no one near him in tarmac.
And that means drivers who were fighting for the title, not one rally.

2 We never saw the Ogier vs Loeb battle for the tittle in a different team.

On the other hand his neat driving style and the amount driving errors (almost none) makes him one of the best for sure