A4Document
Democracy - There are 28 unelected EU Commissioners. There are 800 unelected members of the House of Lords.
Trade - Do you know how long it takes to do trade deals? How long did Canada have to negotiate with the EU? Hint: Much more than two years.
Immigration - So you want all immigrants to earn more than 35k a year? OK. Let's say the fruit pickers and farm help leave. You increase wages, so British citizens actually become interested in those jobs. Cost of producing grocery stock (for example) would rise. Who pays for it in the end? Yes, the consumers... many of whom will be complaining, despite them having 'voted for this'. Let's also fire all the nurses from the EU. See whether that will help the NHS.
Escape from the EU's long term plans to become a superstate - This is sort of laughable, I'm not even going to comment on that. The EU represents a very strong - if also slow and cumbersome - union that would have been mega useful for the time emerging economies begin to rise and overtake us.
Money - Don't people get it? The money that goes to the EU and what we get back does not represent the entire equation. It's not primary school subtraction but non-linear algebra with many different variables.
On top of what the EU 'gave' the UK, there were also grants available for science (that is now already drying up) and research projects funded by the EU that resulted in collaboration across countries. These used to result in innovation that was good for Britain and the companies within it. Sadly, that's now already going away, and we haven't even left the EU yet.
Currently, the UK also hosts the European Medicines Agency (EMA), which approves the drugs that can be sold to the EU. It naturally will have to move when Brexit happens. That's 800 jobs gone, with some people who were experts in their field (but hey, we don't like experts) who will be moved to an EU location. The pharmaceutical industry employs around 200k people in the UK. Guess what will happen further down the line when the EMA moves to its new location?
This is just the tip of the iceberg, but basically... the UK got a lot more out of the EU than the numbers quoted by Farage, BoJo and Gove told you.