First of all I would have really liked to see Guardiola managing an average team as well to see his quality better. Because he started his career with Barcelona B team. And the teams they have managed after that are only Barcelona, Bayern Munich and Manchester City. He has been really successful with these teams maybe. But I also agree that even an average manager would become successful with this kind of teams. Maybe he wouldn't be as much as Guardiola but the player quality would still help a lot.
However I must admit a fact that he literally built Manchester City according to his will after coming here. I think this is a very special time period of his career here because of that.
Mr. Guardiola does owes a lot to the quality and characteristics of the players he has. He doesn't bring utility players; he brings players who can solve problems or perform three or four tasks within a match. Not anyone can play like Guardiola; that's the lesson he gives. Yes, Guardiola excels when he has better players who can handle the ball better, make better decisions. That's obvious. But Guardiola could also play with a team without so many stars, with a possession-based style. Maybe he wouldn't achieve such great results because he would lack the quality of the players, but he could still do it. What should be highlighted, especially, is his ability to make different teams play the way he wants, even changing the style of play for these teams and that's a tremendous achievement for any coach.