The movie theater might be a good example of something that HAS gotten better over time... Better picture, better sound, comfy reclining chairs and a little button to summon the wait staff to bring me another beer.
We don't go often, but when there's something we want to see, it's a better experience than it was.
Yeah this was going to be one of my counterpoints to Catsby's initial post. There are several things that are objectively better than they were in the "good old days" and the movie experience is one of them.
CD brings it up often but it bears repeating-- cars are vastly improved compared to 30-40 years ago. They're more reliable, safer, more comfortable, faster for the same sized engine displacements, more fuel efficient, and all sorts of other improvements. Sure they're more expensive, but everything is.
As far as music-- every generation complains about the "new music" being worse than what they grew up with. But first of all, that's a subjective matter of taste. Most people I know who are my age, just listen to the same stuff they were listening to 30 years ago. And that's fine, listen to what you like. I'm very much on record as being a great lover of 80s music and that's still a large portion of what I listen to.
But I also intentionally spend scores of hours every year scouring the airwaves and the internet for new music. It's a hobby and a passion and I can tell you there is a LOT of great new music released all the time. And one of the greatest things about now, compared to decades ago, is the access and availability of it. No longer am I restricted to what mainstream radio or MTV clues me into. No longer am I bound by what the record labels think will make the most money, regardless of quality. There are now so many avenues to obtain good new music, be it recorded or live, that it's almost an embarrassment of riches. Sure the market is more fractured and you have to search a little harder for it, but there's plenty of it out there.
I have more thoughts on all of this, I'll add more later.