Good television? Today? I'll agree some of it is good but 90 percent is pure mental drivel. The wildly popular Kardashians make me want to vomit. If that was all that was on I'd have no TV. Watching grass grow or maybe watching paint dry is more interesting than most of what passes for entertainment today.
TV today is better than it was 5-10 years ago. The reality show craze has faded somewhat, and though the genre is clearly going to stick around, we still have some damn good shows on TV today—things like Mad Men, Game of Thrones, and The Walking Dead, just to name a few.
Yeah, there's crap on TV. There's going to be crap in the visual programming lineup as long as there remains a visual programming lineup, because some people will pay to see crap.
All that said, what I was mainly talking about was the television available in the '90s (when DS9 came out) as compared to what was available in the '60s (when the original Star Trek came out).