Sometimes Seedorf is kind of lazy and inconsistent vs small teams.
But he is a big game player, usually plays great vs top teams.
He scored 2 long distance goals against Juve while at Inter.
He scored 2 goals against Juve in the 3-1 away win last season.
He scored a wonderful cracker, the winning goal vs Inter last season in the famouse 3-2 game. He also created the first goal with a powerful shot.
He assisted the goal ( scored by Sheva) against Inter, which eliminated them, in 2002/2003 CL semifinal.
He assisted the first goal ( scored by Sheva) away against Roma in the 2-1 win last season.
His powerful shot caused Carroll's mistake and help Milan win 1-0 against ManUtd.
There are many more but I won't bother listing them.
Anyway, a great midfielder, great ball control ( probably the best ball control in this Milan team), good passing ability, good vision, top class long distance shot, can do defense work too. Only little cons: a bit slow, sometimes hold on the ball a bit much and slow down counter speed. We must thank Inter for giving him for free. Where is Coco now btw?