His qualifying performances were largely what let him down, only qualifying in the top four once in the last 17 races of the season, despite driving what has been described as the 'most successful car in F1 history'.
However, it is one particular raceday performance that has led to the latest barrage of criticism, this time from a man who claimed 10 race wins in the sport between 1984-1997.
Perez's rookie error
Berger believes that Perez's inability to keep the slower Ferrari of Leclerc behind him on the final lap of the Las Vegas GP represents an unusual mistake for somebody so experienced.
"Yes, if you lump Max and Pérez together, then on average Helmut [Marko] will be fine again," he told Kronen Zeitung.
"Just looking at Leclerc's overtaking manoeuvre against Perez on the last lap of the grand prix in Las Vegas, I have to say that not even a beginner makes such a mistake."
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