The turnout in the most recent European elections was 43%. The makeup of the EP doesn't support your claim either. It is dominated by essentially the same parties that rule on a national level.
You are mistaken about Czech turnout though. It's the second lowest of all members: http://www.europarl.europa.eu/elections2014-results/en/turno...
[Edit] For comparison: Turnout in the 2014 US mid-term elections was 36%. In the most recent presidential elections it was 55%.