Decent result. And I actually thought Wenger did brilliantly coaching this. He didn't step into Mourinho's trap and kept the risks at a minimum. He could've subbed on more defensive players but then you'd lose all your chances of a win. He couldn't have subbed on any more attacking players because they didn't suit this game.
Cazorla, not in form and doesn't offer the defensive work that Rosicky does. Walcott had to stay because he's a constant counter attacking threat. Podolski just got back from an injury so he was never a realistic option. No reason to make any subs.
A decent result and Wenger was the opposite of naive, which he's often accused of being.