Thanks, but my question was why are the Germans so unhappy with the same aircraft that the UK seems to be more than happy with.
I believe the answer lies in who is complaining: the operators, the maintainers, the contract officers, or the politicians? The flight crews can absolutely love an airplane, but if it requires burdensome inspections or other painful maintenance requirements, the maintainers could hate it. Or it may fly great, and be easy to maintain, but if it cannot meet contracted requirements like airdrop or aerial refueling, the contract officers will hate it. And politicians may hate it simply because it is not built in Germany and/or does not have enough German content. Or the politicians may have spent billions to develop and produce a new armored vehicle (Puma FV, Boxer APC, 8x8 Grizzly?), but there was no coordination between the aircraft designers and vehicle designers and it turns out the vehicle is not compatible with the aircraft. So the answer may depend on who in each nation is shouting praises and who is shouting curses.