Those hardware ratios aren't surprising when one remembers how things looked during the sixth generation. Both the GameCube and Xbox got barely over 1m each in their lifetimes, with the GC being slightly ahead. The PS2 sold more than 6m. I do not remember a more exact amount, but it was way ahead.
What hurts the Xbox brand is that it's too much of an inferior PC and Microsoft's image on the whole. But Germany isn't only a PC + PlayStation country, not even this generation. After all, Nintendo also sells handhelds and they have always been at least moderately successful.