My problem with the music.
It's just too intrusive and over the top. Some of it was beautifully judged and perfect for the relevant scene, but I felt that most of it was too celestial and Godly.
It was just relentless, man! One of the astronauts farts and all these choirs start trilling away. I thought the score for In The Shadow Of The Moon was better, and even that was a bit over the top.