I believe Germany has a tolerance for all kinds of dubious music across all genres.
I believe many other nations are simply quite intolerant to other types of music! I found that very often with Americans and British people. That said, music in the UK is sooooooo mainstream anyway....
Ok, in all fairness, a lot of people in Europe/Germany don't get how embarrassing the lyrics of some of those bands like Hammerfall, Manowar, Primal Fear etc. are. Though... who reads the lyrics anyway?
About Manowar: They're 50% of where Spinal Tap came from, what do you expect? The rest of Spinal Tap is just various other rock elements thrown in there (Yoko Ono for example). I listen to Manowar's stuff from time to time (works for the gym!), but I don't take them any more serious than Lordi, The Darkness, Misfits, Dimmu Borgir, Kiss, Immortal and so on.....