Whether they qualify or not for the World Cup, it doesn't matter (although if countries like South Korea, Slovenia, Russia and Republic of Ireland can qualify for the World Cup then I'm sure its possible for Greece to do so). They out-played and out-thought some of the best teams in Europe (its not like they had an easy run as well, they got past some of the hardest teams) and they barely conceded any goals.

greece play unattractive negative football... true it might win games (sometime!!!) but definitely its not gonna win hearts all around the world
If you're expecting all football to be played in a Brazillian style then yes you might find the more defensive teams dull, but I thought the final was a good, tense game, especially since I was supporting Greece. You can't blame them for not being an attacking team, that isn't one of their strengths, their strengths are that they're fit as fuck, well organised and they clearly have a really good manager. Football is a tactical game, but playing defensively doesn't necessarily mean its bad football to watch.

I thought it'd be a boring final myself, but at first I assumed that once Portugal got one goal, Greece would collapse making it an easy (and therefore boring) final after that, but Greece played much better than I expected...

portugal played badly last
Portugal played badly, mainly because Greece made them play badly by marking their three main threats (Ronaldo, Figo and Deco) completely out of the game. As a result Portugal couldn't break Greece down often enough to make enough decent chances. Then when Greece counter attacked, they looked more dangerous.