What an earth is your problem with Mourinho? How is he overrated? He's one of the best managers in the world (if not the best) and even his fellow professionals acknowledge it:
Guardiola says Mourinho is 'best in the world' - European, Football - The Independent
YouTube - Mourinho crying after Wesley Sneijder speech at FIFA Ballon d'Or 2010
Stankovic: Mourinho the best coach in the world - Soccerway
I could carry on with links but it's pretty pointless TBH as most of the people in football regard Jose Mourinho as one of the best managers in the world and in my eyes there's no debate he's one of the best. But seeming you feel so strongly that he's overrated:
Mourinho at Benfica:
Although he cannot be judged too much for his Managerial role at Benfica as it was his first managerial job and didn't last long. However he did make an impressive start for a manager in his first job with a record of 6 wins, 3 draws and 2 losses, with a win% of 52% compared to their overall season win% of 44%. He left the club after wanting a contract extension to secure his role at the club and test Vilarinho's loyalty to him. Vilarinho refused to offer him a contract extension and Mourinho stepped down. Later on Vilarinho admitted he was in the wrong and should have accepted Mourinho's request.
Mourinho at União de Leiria:
Mourinho did what most managers struggle to do - he got hired again after leaving his first managerial job by União de Leiria. And it was to be Leiria's most successful season EVER (at the time). With Mourinho taking them to 5th place, which was their highest ever finish (until it was matched in the 2002-03 season) and also their highest ever point total - 56 points (still their highest). Although Mourinho only managed them towards the end of the season he did what most teams struggle to do - finish a season strongly. Their good form under Mourinho carried on into the 2001-02 season until Mourinho attracted larger Portuguese clubs. He left União de Leiria for Porto with a great record for a lesser Liga Portuguesa team who had no real stand-out players (bar maybe Nuno Valente) with 11 wins, 5 draws and 4 losses and a win% of 54.84% (an improvement on his Benfica win% where he had less games).
Mourinho at Porto:
Mourinho made an impressive end to the 2002-03 season winning 11 games out of the remaining 15 to secure 3rd place for Porto. In pre-season Mourinho brought in vital players - Paulo Ferreira and Maniche. That season Mourinho completed the treble with Porto - winning the Primeira Liga, Portuguese Cup and UEFA Cup. In the Primeira Liga he won 27 games out of 34, 11 points ahead of 2nd placed Benfica the club who he previously resigned as manager from. In the Portuguese Cup he won in the final against the his previous club União de Leiria 1-0. In the UEFA Cup he was triumphant against Celtic winning 3-2.
Many though Mourinho first full season was a fluke, a one-off and that he wouldn't be able to do anywhere near as well again. Although many believed this was the start of a managerial great's career. He proved the doubters wrong in the 2003-04 season by yet again winning the treble. He once again dominated the domestic league starting off his incredible home form (despite it starting mid-way through the previous season) by winning every single home game, they finished 1st and had an 8 point difference between them and Benfica. They also won the Portuguese Community Shield equivalent by beating Mourinho's former employees União de Leiria. But, the best of all of his trophies that season was undoubtedly the UEFA Champions League where they played Monaco in the final. Although Monaco weren't one of the best teams in the world they boasted players such as; Roma, Evra, Squillaci, Givet, Zikos, Cisse, Plasil, Rothen, Giuly, Morientes, Adebayor, Prso and Nonda. This was a talented squad just like Porto and Monaco proved that by beating teams such as; PSV, Deportivo La Coruña (a memorable 8-3 victory), Lokomotiv Moscow, Real Madrid and Chelsea :-(. Porto meanwhile beating teams such as; Deportivo La Coruña, Marseille, Lyon and Manchester United. Both teams did incredibly well to get to the final, but Porto proved the better team by beating Didier Deschamps team 3-0 in the final.
Mourinho at Chelsea
Following his success at Porto Mourinho attracted big teams. Chelsea was to be the destination for Mourinho and Roman Ambramovich gave him money to spend with Mourinho spending over £70 million. He brought Carvalho and Paulo Ferreira with him from Porto as well as; Tiago, Essien, Drogba and Kezman. He brought instant success to Chelsea by winning the League Cup and the Barclays Premier League, which was Chelsea first top-flight title in 50 years. However, he couldn't replicate his Champions League success that he had with Porto the previous season.
The next season Mourinho again won the double. Chelsea beat Arsenal in the Community Shield and also won the Barclays Premier League for the second year in a row and Mourinho's fourth domestic title in a row.
In his 3rd year in charge at Chelsea there appeared to be problems with the relationship between Mourinho and Abramovich mainly because of the signing of Andriy Shevchenko and Michael Ballack. Despite the problems Chelsea still won the League Cup and FA Cup double also known as 'The Mickey Mouse Cups" nevertheless Mourinho fantastic record continued, but his relationship with Abramovich was even worse than before with Abramovich disappointed to still be without the UEFA Champions League and for the first time in his Chelsea career he didn't win the Barclays Premier League.
Despite Chelsea setting a new record of 64 league games without defeat by narrowly beating Birmingham City 3-2 it was to be Mourinho last achievement at Chelsea. He left in September having been Chelsea's most successful manager in their history and it has to be asked what could have happened had he not fell out with Abramovich?
Mourinho at Inter
Mourinho continued his amazing record at Inter as he won both Serie A and Italian SuperCup in his first season. This continued in his second season where he won the treble. Inter won Serie A, the Coppa Italia and the UEFA Champions League against Bayern Munich.
Mourinho at Real Madrid
After winning 5 trophies in 2 years at Inter he moved to Real Madrid. Mourinho's first El Classico was regarded as a complete embarrassment as Barcelona won 5-0. Mourinho's 9 year un-beaten run came to an end against Sporting Gijon. Mourinho continued to grow his already big trophy cabinet by beating Barcelona 1-0 in the Copa del Rey.
18 titles in 11 years of club management (with substantial breaks from management in that time too) is incredible whether a manager does it with Accrington Stanley, Barcelona or various clubs like Mourinho.
A 149 game home un-beaten run with 124 of them being wins is nothing short of incredible and this alone makes him one of the best managers in the world.
There's also all of the awards he has received:
Primeira Liga Manager of the Year (2): 2002–03, 2003–04
Premier League Manager of the Year (2): 2004–05, 2005–06
Premier League Manager of the Month (3): November 2004, January 2005, March 2007
Serie A Manager of the Year (2): 2009, 2010
Albo Panchina d'Oro Coach of the Year (1): 2010–2011
UEFA Manager of the Year (2): 2002–03, 2003–04
UEFA Team of the Year Coach of the Year (4): 2003, 2004, 2005, 2010
BBC Sports Personality of the Year Coach Award (1): 2005
La Gazzetta dello Sport Man of the Year (1): 2010
Onze d'Or Best Coach (1): 2005
FIFA Ballon d'Or Best Coach (1): 2010
IFFHS World's Best Club Coach of the Year (3): 2004, 2005, 2010
World Soccer Magazine World Manager of the Year (3): 2004, 2005, 2010
International Sports Press Association Best Manager in the World (1): 2010
CNID Best Portuguese Manager in Foreign Countries (2): 2008–09, 2009–10
Love him or loathe him, he is "The Special One". And if you think he is overrated then you need help.