It would seem that some people find it hard to understand why any sovereign nation would subject it's decisions to peer review and subject itself to blanket over-arching authority. Speaking from a UK perspective, this is completely understandable given the experience most people have.
While some EU regulations have had direct consequences for the masses both positive and negative (eg: metric-only selling practices, declaration of human rights) there has been a tendency in the media to wildly exaggerate (and in some cases completely fabricate) some of the things coming out of the EU's regulatory system (eg: Bombay Mix must be called Mumbai Mix, all EU member states must use the EU flag for their sports teams) while under-reporting the retraction of some of the sillier ones (eg: cucumbers must be straight, limits on how bent bananas can be). However, there is no smoke without fire and some of the EU's enforced regulations are truly head-scratching (eg: bottled water packaging cannot claim to combat dehydration, diabetics banned from driving*).
An interesting case is the media and political representation of the European Declaration of Human Rights. It is frequently portrayed as a way for criminals to either evade punishment or force the provision of luxuries (eg: TV, porn) in prison. However, it also states that prisoners should be allowed to vote in elections, a right the UK denies it's prisoners who account for 0.0015% of the overall population, so granting them voting rights in accordance with the declaration would make no measurable difference to the overall elections but may have some effect on local elections where adding the prison population to the electorate could cause a significant political swing and require consideration during a campaign. The media represented this as a further attempt by the EU to soften the punishment prison was supposed to be and politicians couldn't agree to this without fearing they appeared soft on crime to the electorate. When issues are this muddied by the agendas of politicians and media outlets, it's very difficult to accurately gauge the true effect of the declaration
As an intelligent human being taking a scientific approach to the governance decisions of the country, I would refrain from making any judgement call on whether EU membership has been an overall positive or negative thing for the UK as the debate has been skewed by the media's misrepresentation and used by politicians to score political points with particular demographics. Unfortunately I am very much in the minority when it comes to making such assessments.
*Genuine but currently unenforced