And that's different from the Mumakil running roughshod over the Rohorrim until a certain elven superhero oneshot it and its entire crew how, exactly? The show didn't exactly invent the existence of redshirts. Hell in the books Tolkien literally talks about how great heroes like Aragorn or Prince Imrahil were left intact by the Pellenor Fields because they were so cool and badass and had super special ancestry and shit, but the poor peasants that were mere mortals weren't so lucky and died in droves. Sucks to be them.
I will agree it's an egregious example and poorly choreographed, but the people making a mountain out of this molehill better not be fans of every action movie ever where the villains mow down everything in their passage while the hero get to roundhouses kick them in face due to the power of plot armor and we're supposed to cheer because he's so cool, yo.