You can say a lot about the EU that needs fixing but their documentation is excellent. What it needs is for the national governments to get better at communicating how and when they interact with the EU and what the practical effects are. The bigger problem is that anti-EU forces within the EU (usually: populists) do their level best to take every problem in their own societies and spin it in such a way that the EU looks like the culprit. Which makes people believe that if the EU were to go away that everything will be unicorns and rainbows.
> Then you also have people from smaller coubtried who are quite concerned about centralization tendencies in the EU.
Yes, that's one of those peculiar cases: they somehow believe that as smaller countries in a much larger world that they would be able to do better than as a bloc. This makes no sense at all and despite many examples to the contrary quite a few people believe this. But common sense unfortunately isn't all that common and as Brexit proves beyond a doubt going it alone isn't better, it is far worse.
To the tune of a trillion per decade for the UK, money that they badly needed. That there is no serious investigation of how the UK public was swindled surprises me, but then again, it probably shouldn't, after all, those that would be in charge of such an investigation all ended up making out like bandits and they certainly aren't going to risk killing their golden goose even if it dumps the rest of the population of the UK into poverty.