I was born in 1971 and as far back as I can remember people have been complaining about dumb Hollywood movies. People called The Wrath of Khan a dumb movie.
The good old days weren't always good, as Billy Joel said.
Yeah there was a lot of bad movies to, but in the good old days there were at a couple of dozen movies which were really good or stood out or were original. These days you are lucky to find a couple of new major films per year which offer anything substantial or are a real pleasure to watch.