Materazzi played for Benitez at Inter.
"This is not my ideal coach," former Italy defender Materazzi told France Football magazine.
"If I were the president of a club, I would not entrust him with my team. What I didn't like about him at Inter was how he introduced himself to the group.
"A great coach, like Jose Mourinho or (former Juventus and Italy boss) Marcello Lippi, used unwritten rules within the squad, while Benitez wanted to write down 10 or 12 rules. It was like the highway code, or being at school."