He's a good manager not amazing, but he has a team with 4 players that have a stake in being one of the best in their respecitive positions of all time (Even if xavi is past the stage of regular quality play). He should and has shown for the most part that he can do enough to let these players bring home the goods but he needs to do more to motivate them, somethings wrong when the only thing that can motivate iniesta is a classico (He seems to be recovering now though).
Two of those players have been out injured for extended periods. And Xavi has been declining for 2 years. We can't use that against him. We were brilliant when Iniesta and Messi played consistently together in September.