Representative in what way? 700 MEPs for about 450M people means each one has 640k "constituents". Those "constituents" are really a fraction each person all smeared about. Lastly if they were actual people and an MEP were to hold a consultation to get their views it gives each person less than 1 minute each year assuming the MEP was available 24/7/365.
Well if they're modeling if after what we have in the US they pretty much nailed it. 435 representatives for 330M people or around 758k constituents per rep.
There are many different types and implementations of representative democracy. And the supranational technocracy-driven particracy of the EU is only representative in name. It is on the oligarchic end of the democracy-oligarchy spectrum.