"Action beats" refers to the individual actions or moments in a story that keep the plot moving forward. They are the important or exciting events that happen, like fights, chases, or major decisions made by the characters. Full definition
It also has some really cool action beats, occasional bits of humor, and perhaps most importantly, a better storyline for its titular hero. (blog.bullz-eye.com)
Unfortunately, the second half is an abundance of ideas that, a few great action beats aside, will go over the heads of a large portion of the movie's intended audience. (eclipsemagazine.com)
No satisfying action beats, no memorable images, and so little to say that it's virtually impossible to say anything about it in return. (indiewire.com)