For me it's less war scenes like in LOTR and more longwinded action movie scenes, like people fighting or elaborate car chases or what not. One of the many reasons why I'm really not a fan of the superhero genre that seems so pervasive nowadays.
Another reason I dislike the superhero genre these days is because the plot arcs are so predictable. It seems like every movie follows exactly the same beats. At this point they feel more like remixes than fresh content.
I'll give an example of action done the right way: Crouching Tiger, Hidden Dragon. Every action scene shows us more about the characters or advances the plot, so the action serves as a backdrop for the storytelling.