Mourinho did alright at Madrid. He oscillated between really good ( winning the league) and very poor (losing the league by a fair margin to a team with a manager in hospital, and fighting with everyone). Can't say he was rubbish because he did have one great league campaign, but you can't exactly say winning 1 league title was a big success either particularly given how it ended.
Same with Chelsea. One terrific year where he got all his signings spot on, and won the league. But other than the first year where he had no succeed, his last year was the worst in his managerial career and laughably bad with fighting, bitching, blaming etc being the gyst of it.
I suppose you can sum it up with two very good league title achievements in 6 seasons, and some very poor stuff around it.