Milito finally broke his goal drought with a brace, while Samuel Eto'o converted two penalties.
"He was already working very well for the team, but the only difference this time from the other games is that the ball hit the back of the net," said Benitez.
"I am happy for him and for Eto'o. Everyone knows Eto'o would prefer to play as a centre-forward, but we talked it through during the summer in our American tour. Our idea is he can play on the right or the left, but a little closer to the box than last season."