I think so, too. Although I'm almost lost for cinema nowadays because of a lack of time (I write novels in most of my spare time), my girlfriend still goes to the cinemas very often and I know from her that I'm missing several outstanding movies every month. There are also good US productions every year.

What the author perhaps means is the decline of US action movies. They have become faster and dumber over the years and arguably are mostly unwatchable by now, at least in comparison to action movies from the 1970s. Why have they become so bad? I used to think it's just because they are cut too fast and 30 minutes of unnecessary action is added at the end, but now I believe the scripts have also become worse. It would be interesting to hear from an insider like a script writer what has changed.