Average Rotten Tomatoes score per year.
Seen this on linked from Twitter. Not sure of it's accuracy, but it does feel true.
https://pbs.twimg.com/media/FW6nSzhXEAEYQKO?format=jpg&name=900x900
It does seem like every other film these days get's universal acclaim and glowing reviews. With the inflation meaning that big franchises like Marvel getting 60/70-somethings from RT being considered disappointing and worrying.
Another factor is, from my perspective, the sheer volume of critics these days and the ease to become a 'verified' one. Any dork who runs a blog or youtube channel is a 'critic'. Back in the days it was more of a serious journalistic venture from what I gather.
Not that I care much for film critics. I just thought I'd share this graph.