The New York Times says, "Len Wiseman's ''Underworld,'' which opens nationwide today, achieves only loudness, aggressive confusion and one of the silliest head-splittings in film history."
The Slate reviewer didn't like it much either:
The first hour is evocative and creepy: You can't tell if there's a ghost or a devil cult somewhere, or if we're in Shirley Jackson country. But once the trajectory is clear and the squeamish New York intellectual Quaid has to stand up and fight for his homestead, the boringness seeps into you like the damp.
Roger Ebert makes it 3 out of 3, saying
This is a movie so paltry in its characters and shallow in its story that the war seems to exist primarily to provide graphic visuals.
It's so impossible to care about the characters in the movie that I didn't care if the vampires or werewolves won. I might not have cared in a better movie, either, but I might have been willing to pretend.