The characters where okay, I think. Not as good as the original characters, but in difference to TOS the authors made better use of them.
The scripts where okay in season one and two and grew in quality throughout the show and, most important, stayed on a high level.
The design of the 1701-D was just fantastic and so where the sets and the make up and the props. The uniforms looked a bit strange though, I know no non-fan who likes them.
And then lets not forget the music: Just great!