To be fair, they couldn't have prequels that didn't explain how the Republic became the Empire, how Anakin turned to the dark side. I mean it couldn't have been: "Look at all these things that have nothing to do with the last half I already came up with originally!" I understand some people would rather they get to dream up what really happened in their own head (it shows originality and creativity which is a great thing), but you can't really blame Lucas for doing that exact same thing himself.

As far as introducing "new terms and things" that we never heard in the classic trilogy, Lucas has been doing that with each episode, starting with ESB. He introduces new characters, new vehicles, new plot points, the classic trilogy was the same way. I can undertsand how it could end up just sounding foriegn compared to what we are used to, and new doesn't always = "great". But you don't see that as some kind of change in Lucas' approach to this series do you?

Also some things like the word "Sith" were actually around since the very beginning. With Darth supposedly being short for "Dark Lord of the Sith". It may not have come up in the films, but the books (both novels and children's) had it.