Don't get me wrong...
It's funny to say, but Ronaldo is a long-term sport project. The man is obsessed about his legacy and his presence will force Juventus to succumb to his needs and bring a coach & players that suit him. He's ready to play till he's 40 if it means he'll go down as the GOAT. I believe that by the 2021/2022 season we'll be monsters with him as the head of the spear.
But as a piece of the puzzle to the post 2017/2018 cycle? He wasn't what we needed. He just doesn't fit to this team, with these players. As I said, it'll take years for this team to be truly Ronaldo's team.
You need to play fast paced attacking football with players who can feed him crosses. Meanwhile we have... Pjanic, who's slow as fuck, Matuidi who can't control his feet on the counter, Cuadrado and Sandro who can't hit a wall with their crosses if they stood 3 M from it.