Read this...
http://ec.europa.eu/transport/passengers/air/air_en.htm
This outlines your rights... you can ask the aviation authorities to investigate if Lufthansa can claim an exemption from Regulation 261/2004. The airlines are pushing the "exceptional" circumstances excuse, but even the volcano disruption last year was ultimately determined not exceptional and the airlines were required to pay out.
You can file your complaint, in English, on this form....
http://ec.europa.eu/transport/passen...nt_form_en.pdf
The aviation authority is listed here....
http://ec.europa.eu/transport/passen...ent_bodies.pdf
Don't give up, they rely on customer ignorance to get away with this. Incidently, after a delay they are required by law to advise you of your rights. If they did not do so, include this in your complaint.
Hope that helps...