Some of the sides in the 'weak' half of the draw have played good attacking football. But whatever: I learned years ago that most people talking about sport (any sport) on the internet haven't got a fycking clue what they're talking about.
It is certainly true that teams like Croatia, Wales, Hungary and Belgium have seemed stronger than, say, England.
Then again, in my experience football history tends to reaffirm itself in the knockout stages for some weird reason. I would rather face and of the above teams than Spain, Germany or Italy even when they latter look bad.
That reaffirming tends to be more of a World Cup thing (where there are more 'elite' countries) than a Euro thing. Greece and Denmark have won the EURO so I wouldn't rule out a shock. Honestly though apart from Poland v Switzerland (zzzzzz....) the games on the top half of the draw look more entertaining than those on the bottom half.