MassterMark is realy smart, the way I see it. Throwing personal insults is no way to win an argument, and that's what you've been doing all your time here.
Anyway, I'm willing to give a chance to giving you a chance to explain some things:
1. Why Handanovic? Have we ever been linked to him? Is there any way he might join us in near future? Same goes for Thiago Neves, Hernandes and Ben Arfa. As far as I remember this thread is for current Milan squad only, and dream formations with dream transfers don't really fit.
2. This formation is very attack minded with it practically having 2 strong defensive players + one converted winger to a wing back in defense. That is hardly enough to hold a solid slow buildup. Having Seedorf just before of the defense is a recipe for disaster. A slow, attack minded player who has publicly said he wants to play as trequartista is a poor choice for a defensive midfielder. So really, it would suffer in many games, especially in Italy where strong defenses don't let many goals through and tend to squeeze one or two attacks through every now and then.
3. A midfield line of Gourcuff/Ben Arfa, Pato, Kaka, Dinho and Neves isn't a midfield at all. Of all those only Gourcuff is a true midfielder, while Pato and Neves are attackers and Dinho and Kaka are attacking midfielders which really work better just behind the striker or even sometimes as the main attack force while the striker messes up the defense. What would be more reasonable with this team is a 3-4-3 formation which would, again, be useless in Serie A (see Milan-Inter 28. IV 2008). This way, the midfield will play very wide and with out the support of a solid backdrop and center, it would be on it's back foot all the time.
4. Marco/Mario up front alone? No problem, but while Marco has a certain ability, the constant going up and down will wear him out and he'd have trouble scoring. He lacks the pace to play in tune with the team style, which will ultimately be counter-attacking. With the team dropping backwards, defense under heavy pressure, midfield unable to connect more than 5 passes and playing long direct balls upwards/sideways, there is no other choice. While Mario is a better choice as he is a bit faster, he lacks the experience. The kid will probably go off after a few games without scoring and shoot himself in a hotel room.
I can think of a lot more, but I'm tired of typing.