I actually bought the entire DVD set of TNG and watched them with my wife. She loved them. But she had vaguely remembered DS9 from when it was on the air and declared that she didn't like it. I kept telling her it was actually the best Star Trek series of them all (even better than Voyager, which she did watch when it was on the air and loved) but she remained skeptical.
Well, I "forced" her to watch DS9 when I got all of them on DVD as well... and at first, she was resistant, but then after we got into the 2nd Season, she couldn't get enough. She called it our "crack" because we'd spend our weekends watching it and she was really upset when it was over after season seven because she wanted more. She even wanted to go back and watch all seven seasons again after it was over, but we didn't actually do that. We did end up watching Buffy and Angel on DVD and have now run out of those which she has also complained about - she has found her new "crack". I had never watched either (with the exception of the singing episode of Buffy) and I was quite impressed and now await the release of the rest of the seasons. Ok, now I'm way off this topic...