why is this movie underrated i'll never know

Yvaine: Aren’t you tempted?
Tristan: Tempted? By what?
Yvaine: Immortality. Let’s say it wasn’t my heart. Not me. Just a star you didn’t know.
Tristan: You seriously think I could kill anybody? I mean, even if I could… everlasting life? I imagine it would be kind of lonely. Well, maybe if you had someone to share it with. Someone you love. Maybe then it might be different.