Pep's time in Bayern cannot be considered mediocre by any means unless winning 3 league titles in 3 years, reaching 3 Cl-semifinals in a row (let us be honest here at no point did Bayern have the best squad in Europe in those seasons maybe with the exception of the 2013-14 season), and 2 domestic cups (as well as the other 2 smaller cups that he won such as the European Super Cup and the FIFA Club World Cup) in 3 seasons is "mediocre". Surely no sane person would have expected Bayern to win 3 CL's in a row competing with the two Spanish giants and Messi and Ronaldo, would they?
Mourinho's record is nowhere close. A reminder. That RM team from 2010 onwards was the most expensive team in Europe (by far) back then. What Mourinho just accomplished with Inter (treble) is most likely his best accomplishment to date. The hype was enormous and the narrative was that he came to stop our dominance. Something he failed at.
You are very much wrong. Fans in Spain, especially the two giants, very much care about how their manager behaves, the kind of football that their team is playing (maybe RM less) and the media narrative surounding their clubs. There was a reason why the El Clásico were more poisonous during Mourinho's era than ever before (arguably) and after. The Tito episode. His constant spats with the local media. His antics. To just brush it under the carpet is ridiculous as that did not occur back then.
That is your personal opinion. I am yet to see anyone rate his time at RM other than as mediocre. We have been operating with failure, mediocre and success in this debate. Clearly his stint belongs in the mediocre category and closer to failure than success given the expectations and what I wrote above.
Only seen English media (at the time) consider his stint anything else other than mediocre and that had more to do with them having had (historically) a love for him. Something that is no longer the case after his meltdowns of recent years and failures.
Unlike Pep who is creating history in England while we speak during an era where the league has never had as many great/good managers at once and with more money floating around in the league than ever and with even the likes of Liverpool spending big money. All while competing on all fronts (all 4 tournaments). Winning one of them, being a favorite for the FA Cup and the EPL title. Not exactly what I would call "mediocre". Coming off from a record season in the same EPL.
Like with Bayern (even less so) the current City team is not even better than that of PSG on paper so expecting them to win the CL, if not it will be a failure, is ridiculous as well. However we already had that discussion before.