It depends what you call mean by can't defend. A player like Scholes can't defend to save his life. What he has is though is postional sense. That is why he survives in a 4-4-2. Sneijder is not different IMO, for he has fantastic positonal sense. So he shouldn't have trouble in a 4-4-2. At least the few time I've seen him int he system he has had problems.
I wodner. I coudl have sworn Holand played 4-2-3-1- that summer. With the 3 behind Ruud having free roles, yet keeping the width. Besided in his first season at REAL he was pretty good yet he spent a sizeble amount of it on the right flank.
I agree. But it is still playing on the wing. One can escape with playing like that if you have fullback who can do all the defensive work for you and master ball winner in midfield. Remember REAL with Zizou and Figo on the wings.