In my opinion, a close relationship with Europe is far preferable to being dependent on countries such as the US, China, Saudi, etc., for trade deals. It could also be argued, I think, that there was some sense in countries being part of an organisation through which they could trade freely whilst at the same time protecting workers' rights and having a regulatory framework to protect consumers and the environment.
However, I think the EU has got a bit like those extremely successful businesses that find themselves to be quite powerful and so decide to branch out in all directions, acquiring businesses here there and everywhere and over-stretching themselves. Whilst I think it is right and sensible to try and help other countries to achieve economic parity with their neighbours, I think it was foolhardy within a relatively short space of time to invite so many countries into the EU which were on a completely different economic footing from the current members. Greece is a country that has suffered greatly and which has been brought to its knees and which, on top of all its economic problems, has been given little assistance to help re-settle/re-locate the refugees who have arrived on its shores. Instead of rallying round supporting Greece, it was humiliated and abandoned - not a great advertisement for membership.
Another way of viewing Europe is how many developing nations may see it - as a club which excludes them and whose trading arrangements negatively affect their own trading position. So whilst the EU countries were trying to create a fairer and more prosperous Europe, it was impacting unfairly upon those people outside the "club".
Having said all that, because I feared that leaving the EU would make us even more economically dependent on and culturally influenced by the US, and that those on the right would take full advantage of their admitted wish to have a "bonfire of regulations", I voted to remain. Had there been a left wing Labour government in power I might have voted differently. But I saw the sort of people, businesses and organisations that were championing Brexit - and the whipped-up notions of inward-looking nationalism that pervaded their arguments, and decided that, with a Conservative government in power, it was too big a risk to take.
Now, I feel disillusioned with both "camps" and I think we are in a real mess. I don't know what the answer is. I do feel strongly, though, that going in with all guns blazing will be like a red rag to a bull (forgive the cliches). Unfortunately the team cobbled together to deal with "Brexit" appears incapable of forming any coherent strategy and incompetent people like Boris Johnson and Liam Fox just add to the chaotic mix.