Talking about Juve's defence I'm personally on R7's side on this one
To me saying a great defence means that at least your CB pairing needs to be top quality and nowadays few teams have that, imo only Chelsea and Man U with Terry/Carvalho and Rio/Vidic can say they have a great defence.
Just having one great CB does not make the defence great, there will always be your Kaladzes, Materazzis, etc that could cost you. Juve have Chiellini and probably Mellberg will be playing next to him, (kurt is going to kill me for this but...) I think gaps will be left because Mellberg will be the weak link, I'm not saying he's a bad defender, he's had some really good games with Juve up till now but he's not of the same quality as Chiellini. This imo gives us a better chance at scoring.
Having said that I'm more worried about our defence, Kaladze most likely will touch the ball with his had in the area because for some reason he thinks we're playing valleyball now instead of football, I would be far more comfortable seeing Favalli start instead of him. Maldini is still great but if he doesn'r read a play perfectly and intercepts, he doesn't have the pace to run back, so he really needs to play out of his skin and once again defy his age for us because atm he is the best defender we have.
As for formation I would personally like to see this
Zambro--Maldini--Favalli--Janku
Ambro--Flamini--Seedorf
Kaka
Sheva--Pato
But I know Carlo will go for this
Zambro--Maldini--Kala--Janku
Ambro--Emerson--Seedorf
Kaka--Dinho
Pippo
I don't think Pippo should start. We need Pato up there to run at their defenders and make their lives as uncomfortable as he possibly can, Chiellini will eat Pippo up if he plays alone in the xmas tree. It would be useless to put him against Chiellini, he would beat him on everything, pace, heading, strength, stamina. We need Pato up there so he can ruffle a few feathers and allow Dinho/Sheva and Kaka more space