The long term aim of EU should be build a federal European state. There are some major problems thought:
- European citizens don't really "feel" to be European, they are first and foremost French, German, Italian and so on. There isn't a cultural base to build an European state (yet, I think this problem will be solved when they younger generation, grown with Project Erasmus, will have power).
- As a result, even thought there wasn't a major war in Western Europe since WW2, countries still act indipendently and have been played (and still are playing ) "economic wars", so-to-speak.
- In the past some countries joined the EU even thought they had many economic problems (Cyprus, Romania, Bulgaria) or they didn't really solve them structurally but "hid" them in the short them (Greece, Italy).
- People in power aren't elected directly by the people. The EU feels like a byzantine organization run by bureaucrats.
- Even major countries have been different economy: a week currency is good for Italy but bad for Germany, for example.
I really hope in the future we'll start act more like you single, big nation. I really hope EU will be reorganized because the alternative is seeing it being disbanded and I don't want to think about it the consequences of that.