My comparison of the squads of the teams that will be the top 4 at the end of this season (if Ranieri stabilizes merda)
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FWD:
Matri, Vucinic, Quagliarella, Del Piero
Ibrahimovic, Pato, Cassano, Robinho, Inzaghi
Pazzini, Forlan, Milito, Zarate
Cavani, Pandev, Lavezzi, Lucarelli, Mascara, Chavez
Milan obviously have the best foward line, though a little reliant on Ibracadabra. Cassano has been quite good this season and Pato scored a very good goal against Barca. Robinho and Inzaghi provide very good depth with Robinho more than capable start as CF or striker.
Inter's attack would not excite me as much as any of the three's would. Milito will never regain the same form as under Mourinho, Pazzini is not better than say Matri or Pandev and Forlan is definitely not getting any better. Zarate is very inconsistent.
Napoli's attack is heavily reliant on Cavani and would be pushed out of top 3 if it weren't for him. However, Cavani along with Ibrahimovic are by far the best fowards in the league and both could start for most CL teams.
Juventus' attack has 3 very dynamic centre fowards/second strikers and one very good poacher. Having said that, it would surprise me if any of our fowards would even start for Milan. Maybe Vucinic if he could stay consistent.
Milan(3)>>>Juve(2)=Napoli(2 + 0.5 for Cavani)>Inter(1)
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MID:
Pirlo, Vidal, Marchisio, Pazienza, Krasic, Elia, Pepe, Giaccherini, Estigarribia
Seedorf, Boateng, Aquilani, Nocerino, Gattuso, Van Bommel, Ambrosini, Flamini*
Sneijder, Cambiasso, Stankovic, T.Motta, Alvarez, Muntari
Hamsik, Inler, Gargano, Santana, Dzemaili, Donadel, Maggio,
Pirlo is the best out of all these players in terms of creativity and Vidal is the best box-to-box or defensive midfielder. So best two players of each type for two man midfield. Lacking depth in the middle though no European competition should serve to ease pressure on players. Good pace on the wings though none of them can guarantee a good performance every game.
Milan's midfield lacks that X-factor though Seedorf especially and Aquilani can play quite well at times.
Cambiasso has been terrible lately and not sure about Stankovic. Sneijder is Inter's best player and rely on him as much as we rely on Pirlo. Not sure on Motta's form either.
Napoli have quite a strong midfield especially after acquiring Inler who gives them some extra quality.
For their respective formations: Juve(2)=Napoli(2)=Milan(2)=Inter(2)
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DEF:
Lichtsteiner, Bonucci, Barzagli, Chiellini, De Ceglie, Motta

sergio

, Grosso, Sorensen
Abate, T.Silva, Nesta, Zambrotta, Taiwo, Mexes, Bonera, Yepes, Antonini
Maicon, Samuel, Lucio, Ranocchia, Chivu, Cordoba, Jonathan, Nagatomo, Zanetti
P.Cannavaro, Britos, Dossena, Aronica, Campagnaro, Fideleff
Juventus has probably the best right back in the Serie A right now along with a top 3 Serie A CB and top 5 europe CB when on form, though Chiellini has been looking shaky this season. Barzagli has been very impressive but the LB spot is a gaping hole. Also worst depth out of top 4 teams. Sorensen is still inexperiened and Bonucci and Grosso are both extremely inconsistent. I have no words for the excuse of a footballer that is Marco Motta.
Milan has one of the CB pairings in Europe. Nesta's game vs Barcelona taught a lesson to everyone else and reminded everyone of what the glory days of defending were like. Thiago Silva is one of the best defenders in the world right now and matches Nesta perfectly. Abate is getting better every game and Taiwo, though injured, was a very good pickup for free. Good depth in Mexes, Zambrotta and Yepes.
Inter has a decent defense though ageing. Will be caught out on a counter against teams with fast wingers such as Juventus (Krasic & Elia). They have the best depth for RB & LB positions. CB depth is decent.
Playing a 3 man defense, Napoli have two very good defeners in Cannavaro and Campagnaro. Aronica is probably 3rd best CB but they also have good depth.
For respecitve formations: Milan(3)>>Inter(2)>Napoli(2)=Juventus(2)
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GK:
Buffon, Storari, Manninger
Abbiati, Roma, Emilia
De Sanctis, Colombo, Rosati
Julio Cesar, Castellazzi, Orlandoni, Viviano*
Juventus probably has the best goalkeeping department in Euorpe. Manninger would almost be good enough to start over De Sanctis for Napoli. Storari is good enough to start for Juventus. Buffon needs no explantion, when in-form, the best goalkeeper in the world.
Cesar definitely didn't look as sharp last season or this season so far, though injured Viviano is a very good backup but I can't include him for ratings since he will be out for most of the season.
Milan could probably do with a new goalkeeper though Abbiati is pretty good.
Napoli's GKs are good but not special.
Juventus(3)>>>Inter(2)>Milan(1)>Napoli(1)
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Score out of 12:
Juventus: 9
Milan: 10
Inter: 7
Napoli: 7.5