The Spaniard brings his Napoli side to London to face the Gunners in the Champions League on Tuesday.
Asked if Benitez was given a rough ride at Chelsea, Wenger replied: "Yes."
He added: "People were tough with him because they didn't expect him to go to Chelsea but he did very well. He dealt well with it.
"In the end, with time going on people will realise that he did well."
"He (Benitez) is a top class manager and he has proven that," said Wenger. "When you are confronted by his teams, you know that it will always be difficult."
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