Spain don't attack, they have possession and just wear teams down with it, once they have a goal they're perfectly content just to sit there passing it around for whats left and do absolutely fuck all, its tedious viewing
I agree that the matches are tedious, but it's only partly Spain's fault. Opponents play with fear and park the bus, so every match is like this - although Croatia weren't as bad. They're just passing it around to lure their defenders away because it's so difficult to break down these tactics. They keep finding a way though.