As much as it is good to have a great coach manage your team I feel motivation is more important. A national team manager only ever sees his team every so often for a couple of days. There's only so much coaching that can be done which is why I think it's more important to have a good motivator. I don't see Capello as this, he can hardly even speak the players language. By the sounds of it he just goes mental, shouting incoherent words and throwing things about the room. Weird more than motivating.
This could be why Maradona is having so much success so far.