Most manga/anime/game plots are simple enough that I wouldn't bother getting spoiled by names. Whenever there's a story with a bigger twist, I can't recall having been spoiled by names alone. Personally I also like villains having evil sounding names. That ought to be language/culture dependent, but despite Finnish not even being an Indo-European language, I still find Sauron to sound like the name of an evil guy and Mordor a place that wouldn't serve as a happy tourist resort.

German words often sound good and strong, so I won't blame the Japanese for wanting to use them like that. In this series' case, I'm absolutely certain the author even knows what the words mean.