The MESS is caused by the baby boom and Greece's liberal government funded pensions
I'd argue that this MESS is caused by the high level of labor and business regulation in Greece.
Ireland got into a big debt crisis as well, but because it has a high level of economic freedom, it was able to exit its rescue program due to economic growth (despite "austerity").
Spain has just begun to reform its labor and business regulations, and it is finally showing some return to economic growth
Germany had the Hartz labor Reforms before the economic crisis, so it never needed a rescue.
Greece remains last in the Eurozone in economic freedom rankings and highest in the Eurozone for corruption rankings.