Greece screwed up Greece before they even joined the eurozone. They weren't even eligible for that but still managed to do so by cooking the books (with the help of the likes of Goldman Sachs etc).
It's somewhat ironic, for instance, to consider that it was the UK that particularly pushed for expansion. Not only did they lobby hard internally beforehand, they were (IIRC?) only EU country to immediately grant free immigration from the new members, without any transition period - how times change!
The emigration, life expectancy, and growth data don't say that. Not even the public debt data say that.
I will clarify in case the reason is that I didn't explain myself properly: the data don't say that Greece screwed up so much before the current crisis.
It has been always a country with problems but the statistics were improving until they get "rescued".