Sounds like common practice at Stern. When I visited the factory for the very first time in 2005 or so, Sopranos was on the line. I was walking around, waiting for my ride to finish his meeting, and came across a fully populated playfield with a note on it to fix it. The shooterlane had a hole through it the size of the nail on my index finger. It made me wonder why they built that playfield up in the first place, plus that I wouldn't like to be on the receiving end of buying that game.

Since you're in Germany, chances are you never heard the original actor's audio of the movie, as that's all dubbed in German in German theatres. So the voice calls will not sound familiar to you anyway, regardless of whether they are the original ones or voice actors reading a script. That may help. But I'm happy that you enjoy the game so much

Played GOTG at the EAG Expo show in London this week and I found it a great shooting game. Very fast. The movie score sounds great during the modes. The voice calls didn't bother me and the added songs are a nice addition to the game (although it seems a bit odd they start when you end a mode). The only issue with the game at the show was the single droptarget trapping balls behind it. Other than that I enjoyed playing it.