Whedon's script is not great but it's filled with interesting ideas, which Jeunet latches onto and expands and manages to make even weirder in execution than they were on the page. It's a gross, goopy, insanely pretty movie and though the tone and overall style doesn't totally click with what's on screen in the previous three entries, it's perverse in the way an Alien movie should be and it feels like a Dark Horse comic come to life in a lot of ways. It's pretty superfluous in the grand scheme of things in regards to how it slots into the overall world/story, but that's also part of its charm at this point, the extent to which it is so removed from what's come before. I've grown to really dig it over the years.