1. The music was lousy in that I don't remember one note of it. It was just additional noise for the most part and instantly forgettable from one moment to the next. The original '78 John Williams' theme so perfectly encapsulates the idea of Superman that it would be indeed hard to follow and recreate that feeling. MoS' music doesn't even try and is just disposable noise. It's little more than just another sound effect.
Personally, I didn't think it was that bad. The movie from the 3rd trailer (I think) was particularly anthemic. I'd recommend the track "What Are You Going To Do When You Are Not Saving The World" from the soundtrack.