I consider myself a mainstrean horror fan (even if u can't tell from my nick) I have watched almost all the classics continuously as well as the sequals, except for the Omen cuz that smile on Damien seriously creeped me out at the end (one of the few things that did freak me out, i didn't think the movie was that scary, just the basic concept) and I LOTHE 28 days later, maybe because of the undeniable resemblence to Resident Evil, which disgusted me wth the grueling disease dogs, but I though it just wasn't very good, for no real reason, i found it predictable and just bad, for lack of a better word, I love the feeling you get when you get scared, and truthfully, many movies scared me more it was just bad and there truly is no other word to describe it. House on Haunted Hill was not that great either, I loved the scenes with the ghosts but not the in between stuff, i really enjoyed the suspense of the film, 13 ghosts was all right but it seemed more gruesome than scary, the concept for both 13 ghosts and HOHH was really good, i just thought they could have done better when creating the actual film.
Back to the topic, Underworld, it was completely predictable once you got halfway through the story.