Sergio Marchionne has said with having the best car on the grid, it was technical issues and bad drivers that cost Ferrari the championships.
Sergio Marchionne: "Ultimately it's a reflection on the way in which we manage the businesses. It was a combination, especially in the second half of the season, between technical issues and driver error – or driver misjudgement."
"So, we have done well given our starting point, we were unable to finish the task. It's a 2018 objective now. We regret not having done better, but the car is there – it's in my view the best car on the track today."
https://www.motorsportweek.com/news/id/16285
Funny that, I also said the same thing a few weeks back.