The EU maintains and improves standards for the environment, food, safety and some investment standards and competition rules. However each country can still make their own laws for other issues such as health, education and taxation.
Some EU decisions have not proved very popular such as standardisation of cucumber, bananas and regulation of competition rules.
I’m sure other gransnetters can think of many other examples. Perhaps the regulation about free movement of people has caused the most anger, especially in the UK.
If the EU was a dictatorship all countries within the union would have to apply the same laws across the whole of the EU. So no, the EU is not a dictatorship.