The 2010 FIFA World Cup in South Africa.

With a game like that, the Greeks wouldn't have gotten past anyone else in the playoffs.

That's how they won the European Championship.

Tieru, you're actually contradicting Alex, but just so you know:)

Getting out of a group where there's no one besides Switzerland, and who are the Swiss anyway? ... typical European underachievers ...

I disagree. The Swiss are potentially stronger than the Slovenes, and many other average European teams. But that's not the point.
The Greeks aren't top-tier players, but they know how to do what the coach wants them to do. Therefore, it's unfair to say that they didn't deserve their spot. And the fact that they only managed to score 1 goal is simply their style. When they won the European Championship, they also didn't score many goals in those matches, and they don't have any outstanding attacking players. There was Stelios at one time... I don't remember his last name, he played well in Bolton, but in the national team, he still maintained the overall game plan.

P.s. I hope the French play in this World Cup just like they did in 2002, when they didn't score a single goal. They are the ones who didn't deserve to qualify for the championship.