As photography and CGI improved, writing went down the toilet. Mainly because it's not necessary to make money. Most viewers are happy enough for bad plots, so-so acting, dubious congruency and limited dialogs as long as it's visually entertaining.
As usual, the wider your audience, the duller your product has to become to accommodate everyone.
The worst is definitely dubbing. In France you can clearly see that around 2000, producers gave up any effort on looking for decent translator and voice actors. The voices are always the same from one movie to another, the lips don't match, the jokes are lost.
When I watch the 5th element or the naked gun however, I'm amazed at the fantastic work they did to translate the spirit of the lines so beautifully.
Still, sometimes on netflix you got some very nice surprises, provided you watch it in orginal version only. "The good place" and "Dirk gently" really made my day.