This is likely an old complaint—in fact, it's probable it was the first ever criticism when the site started—but I wish io9 decoupled its science and science fiction coverage. I love both but it's tonally jarring to see a bunch of pop culture posts and then an important and necessary science discovery article that looks like the rest. It cheapens it to be included in comic book stories and interactive lists about your most frightening science fiction and fantasy movie scene.
I'm sure the editors at whatever point in the site's life have thought about this, and rejected it because there's no money, honey. But if there were, why not do it? Get a good stable of new science writers and new SF writers and cover both topics more in depth. Just me two cents.