Hence why I said “helped” — he absolutely was not a legend in football management globally before coming to City. His reputation as a good manager was established, to be sure, but I don’t think any reasonable person would say he had the same level of prestige before City as he did after (for good reason, as his very real achievements with us set him apart).
I can’t say I would agree that managing the Italian national team now is more prestigious globally than what he did with City. At least, not until he wins the World Cup with them ( ;-) ). Though, I do agree it is more prestigious in Italy.
I am not sure if you think I am criticising Mancini, but that was definitely not my intention. I was only making the obvious point that he is unlikely to outright slag off the club that will help him from a reputation and financial standpoint for the remainder of his football-related career, unless the club does something horrible that really can’t be ignored or he creates a level of prestigious completely independent of his exploits with City (i.e. manage Italy to a World Cup win).