He'd be better than Dunga. Which isn't saying much, of course. Toninho Cerezo, who actually works as manager of real-life teams, would be a vast improvement over Dunga. Even Joel Santana would be better than Dunga.
Yesterday Liternit offered some arguments against having Muricy manage the NT, and I guess he knows Muricy better than I do. One guy who I'd like to see being given a shot would be Paulo Autuori, but he isn't on the spotlight so nobody ever mentions his name.