Then you are doing yourself a great disservice. While some of the other spin-offs are questionable, TNG is probably the best sci-fi show of that era. It was genre defining to the point of being able to watch ANY scifi show today and have it's plot rooted in a concept already explored in a TNG episode.
I mean StarGate SG1 and Farscape, in particular, were pretty blatent in just lifting ideas.