I love him as a personality and I love his managing style. Very arrogant (with reason) towards everyone, always withdraws attention to him and not his players (thus eliminating a LOT of pressure, as he can cope with it easily). He always manages to get what he wants out of his players. (a good example is Eto'o basically playing as a right-back for a full game, when he's a striker)
He's tactically perfect, not a thing goes unnoticed. I don't know what's bad about him in any way, he's just made for football. One thing that delighted me particularly was his Barcelona 1 - 0 Inter game. He was probably thinking "They want the ball? Let's give them the ball!". The ball possession at the end of the game was something along the 80% to 20% figure, but Inter controlled the game - without the ball. That's definitely very special and just one of many spicy details he has.
P.S.: 17 official club titles in 10 years is really something to behold in awe, specially seeing as he never managed a theoretically favorite team in a competition for the first year he's been there. (see: Porto for the Champion's League and the UEFA Cup, Chelsea for winning the Premier League all those times in a row, Inter for the Champion's League again)