I just think Holland have been good enough to score and entice the opposition on to them - hence the counter-attacking.
When a tighter game comes along, they're perhaps losing 1-0 and the opposition sits back and defends strongly, I still think the Dutch have enough versatility and quality to break them down. I don't foresee any problems tactically there. Guys like van Persie, Robben, Sneijder and van der Vaart can break down any type of opposition with precise & intelligent skill, a piece of magic or a well worked piece of interplay. They seem really sharp and knowledgeable about their own game, their own team game, which is interesting in itself.
Then you have the World class poaching of RVN, just ready to pounce on any sighter he gets. Then someone like Kuyt who can get stuck in, hassle Defenders and make things happen through sheer penetration and determination.
I hope they are tested in different ways in this competition to see how they do react. But as long as the quality remains fresh & fit and the spirit remains high, they'll not be stopped by anyone unless the opposition have a similar quality of attacking prowess and team spirit - like Spain.