If you were looking at this tournament from a neutral perspective, you'd be a bit salty too. What Portugal is doing now is similar to what Greece did in 2004. Remember that feeling, and you'll understand why some viewers are frustrated.
How are they similar? Portugal has reached every EURO semi since 2000, when Greece won it in 2004 it was their 2nd major tournament qualification in their entire history. And if you're talking about style of play, the only game in which i'll concede that we just sat back was against Croatia, in every other game we went for the win.
Iceland: Very unlucky not to win with so many chances
Hungary: 2 lucky deflections for Hungary, 3-3 was a fair result nonetheless i guess considering how heated the match was
Austria: Very unlucky not to win with so many chances
Croatia: We just concentrated on not losing.
Poland: After the 1-1, we were far superior, eventually becoming the only team trying to win it.