To what extent has the European Central Bank(ECB) achieved its target since the launch of the Euro? How might the performance of the ECB be improved?

To what extent has the European Central Bank(ECB) achieved its target since the launch of the Euro? How might the performance of the ECB be improved? Order Description There is no need to state useless things such as history and structure of the ECB. Please use examples to support arguments. For example, ECB cannot make monetary which benefits every member. That's why Germany performed excellent due to low inflation and Euro devaluation and Greece now facing debt crisis. I'd be happy with more arguments, evidence and examples.