Most moviegoers don't want subtle psychological horror, they want alien goo fests with bloody membranes flying around in a UT-style gibfest with rampant nudity and cheesy scientific explanations. If we can't defeat the goo beast by uploading a virus using a macintosh, the movie sucks to most people. I suspect most people who don't like Blair Witch like Species more... you know, the one with nudity in every scene and where one of the main characters reloads his gun after firing twice, then fires ludicrous numbers of rounds without ever reloading again.