For me, Pellers has never been a particularly good tactician. I've seen him do some very strange things in big games, such as playing1 Demichelis in a single-pivot against a rampant Chelsea, and sticking 2 Kolarov at left-wing against Barca. He doesn't seem to be excellent at setting up a compact defence like Mourinho or Simeone, or making excellent attacking mechanisms like Ancelloti. Nor is he a top innovator like Guardiola. Okay, we do pass the ball well, but we do have the most technically gifted players in a league full of kick and rush merchants. We passed the ball equally well under Mancini.
I think Pellegrini, as a manager, is excellent at managing people. I think much of our success last season came from the players feeling loved and being instilled with confidence, as opposed to a tangible improvement in tactics. Unfortunately, it now appears that the initial psychological effects of Pellegrini's good man-management are starting to wear off, and his tactical naivety is being truly exposed. If the players are beginning to lose faith in him, I don't believe that he has the tactical and technical skills to illicit a real improvement in performance. I hope I am wrong, as I think the club would like to see him stay until Pep becomes available.