I dont know why some people are saying Mourinho can only manage teams with money.
If you watch it closely you would see that he buys players that are effective not showy players and because it is Chelsea coming for them, the prices are put up to ridiculous extents.
His kind of players are Drogba, Essien Carvalho etc, players that under normal circumstances should cost too much but because it was Cheslea , the price went way up.
He could easily have demanded Ronaldinho, kaka, Henry or the big stars, he did not do that because he does not need them in his ideology.
Would he be able to mould Nocerino, Criscito, Iaquinta, Camoranesi into better players? Absolutely
Would he have use for Trezeguet? I seriously doubt that
Dp and Nedved would be sued accordingly and in areas where they can do damage not because of their names
In saying all that I think Ranieri is excellent tactically, his failings might be decions making at the right time but as far as tactics are concerned.
Do we need him? Well I guess you can make your minds up, for me Mourinho, Juve or Inter are like a match made in heaven in different ways