Tax evasion was basically 100%. Sure, it's easy to say "I'm only cheating a little, blame the big cheaters" but everybody was in on it. The ones paying for it chose to be unaware of what was happening.
Yes, as far as I know this is correct. In fact, reports by the monitors said that there wasn't even a capability to actually collect taxes in the tax collecting agencies, apart from no willingness and no real idea of how/why.
And as usual, it is easier to divert blame to "evil foreigners".
Not that there isn't internal dissent: http://www.euractiv.com/euro-finance/greek-journalist-acquit...