Well, you have to consider the times the movie was made in.
At that time, the last vestiges of the Hayes Commision (a censorship board started in the 30s, which had about 14 things you couldn't do on film), so it broke a lot of barriers for the time. At the time, nothing was really that violent, so it started the original 'ultraviolence' that we've gotten used to. But when it came out, it horrified some people.
The synth score was done by Walter (later Wendy) Carlos, the transgendered synth genius. At that time, synths were just available to the rich and famous, and it was a lot of people's first exposure to synthisizers in general (beliive me, I took synth class in the late 70s in college, and we had one of these monsters to play with. It took 5 patch cables just to get the keyboard to work..
That being said, it hasn't aged all that well, but it was interesting at the time.