I've got to agree with you. Watching it right now and the visuals are mostly nice, it's well shot, but the music is not so good. Sounds like what you said ranging to corny 1970s-1980s low budget TV movie levels (and there's TV movies from that era with better scores lol). Now that the film is getting 'darker' in tone, the music has improved a bit, though.
The dark chanting wasn't so bad, and Wagner is always nice, a real treat after the rest of the music.
So now that you've watched the whole film, did you notice that the score was quite literally composed of mainly 2 VERY SLOWLY played notes?! Very rarely was this monotonous music broken up with a 3rd. Another thing that irked me was that this score employing 2 slow notes was played over and over and over again throughout the entire film! I couldn't believe it...I love how it looked and Herzog is an absolute MASTER of film! The stupid 2 note score nearly ruined the film for me.
Are you insane? Many various, different and great notes are heard.