The people in Europe see, how many regulations just come from Brussels to be just acknowledged by their own parliaments and the democratic process is just circumvented. They see, how much is just for the benefit of big corporations and not for their benefit.
In Germany, we see, how the European idea is misused by our own politicians to bring up laws that they would not dare to let be voted on in their own parliaments. They just go to Brussels, let the law be decided there without much democratic intervention and than the law comes back into our country to be just acknowledged without discussions.
The European idea is (was) a good one. A really united Europe would be a good thing and also a strong one. But that is just an idea and not the reality. We saw it with Greece. We are not united. In the end, every nation is just looking on their own benefits and money. We Germans really acted shamefully in this situation and we already have a big trench between northern and southern Europe. Old sentiments and even hatred is growing again in the EU.
The idea was, to have a Europe, where never again will be war. We are now steering in a direction, where wars are getting more likely again, this time because of the EU and the Euro.
Is it good, that UK leaves the EU? No, it is not.
The only thing, I hope is, that the politicians might learn a lesson from it or the whole EU will break.