Brodeur raises the level of play of his whole team. His puckhandling and rebound control are unmatched in the whole world, which gives Canada a lot more leverage. Defensemen don't need to stay in the defensive zone for as long, and they don't need to box around the crease to control rebounds. Luongo may be slightly better at keeping the puck out of the net (he isn't showing it today) but, he has zero puckhandling skills and his rebound control is abysmal.
edit: my picks are Sakic for Canada and Havlat for Czech.