You're right about the apathic feelings that a certain number of EU citizens have towards the EU. Those feelings include several topics, such as sovereignty of the individual member states, open borders and immigration, and corruption. Simply put, many people desperately want reform. In the past, however, prominent people within the EU named these eurosceptic feelings populistic. With these new results, the EU will hopefully learn to understand what caused these eurosceptic feelings to come into existence. Besides that, almost 1 in 5 seats in the EP will go to Eurosceptic parties, which is not exactly 'really low'. Edit: I also think that so-called 'anti-democratic' parties fit perfectly within the European Parliament. Do the referendums of 2005 ring a bell?