This doesn't sound out of line. $60-$70 per country is about right, and the strength of the Euro is hurting you also. Doing a dummy search on ITA, you have the following taxes, though for some reason, your ticket only shows nine tax entries instead of ITA's 13 entries. (I didn't include the amounts since they could vary depending on a your exact flights.)
German Air Transport Tax
German Airport Security Tax
German Passenger Service Charge
Greek Airport Development Charge
Greek Passenger Terminal Facilities Charge
Greek Security Charge
US Customs Fee
US Immigration Fee
US International Arrival Tax
US International Departure Tax
US Passenger Facility Charge
US September 11th Security Fee
USDA APHIS Fee