It really isn't only Greece and Portugal. France in particular are set up to be strong defensively first and foremost, with Deschamps relying on his offensive players to do "something" more than with any grand tactical ideas. Spain set up similarly, though they recognise their comparative lack of quality compared to other teams, and try to do some interesting things in midfield.
International football just isn't systems-based any more, compared to the great Spanish and German teams of the recent past. It's much more situational, and more defensive.