I did AQA, and I got my A2 results, I got a low D in my coursework, but because I aced almost every other module, I got an A overall. German is a hard subject and can be marked harshly, however, it cannot, on AQA at least, be marked any more harshly than French or Spanish.
People are blaming the exam boards like they always do, but realise that to get the A in German you have to work really hard, and if you didnt do it at AS level, A2 is gonna hurt you all hard.
Having said that, to the few that had Bs and Cs and were gonna drop it, don't. A2 is harder, but much more fun and you can retake modules and still come out with an A. My friend had a C at AS but he turned it into an A this year. It can be done. Do it.