Meh. I wouldn't say that. As I said, they did enough to win each and every game, but aside from brief spells never really looked like a dominant force. It's impressive in its own way, to always have that extra gear in the bag for the moments needed.
But as far as most dominant ever, come on. Brazil in '02 went through the world cup with 7 wins - 0 losses and outscored their opponents 18-4. That's dominant.
France in '98 too, went 7 wins - 0 losses. Outscored their opponents 15-2.