Will QE really save the European economy?

At the beginning of the crisis, in the Eurozone we had two different factions: on one side, Germany with its austerity measures, and on the other side Mediterranean countries, spending and wasting. When Draghi arrived at the ECB, he supported ultra-expansive policies and helped Renzi and Hollande with the implicit Merkel support . But were these moves really effective in the EU? And why did he adopt them so late? A thorough analysis on Limes