Because it's nothing like the first movie. First, it does take itself seriously. Very, very seriously. It has a horrible, awful hackneyed, melodramatic romance subplot that is not played for laughs whatsoever. Then, instead of getting a wide variety of whacky zombies, we get some hybrid of The Crow/Frankenstein zombie with a lust for revenge! It was one of the worst viewing experiences of my life. I don't brandish the "worst movie ever" tag or even mention anything in that ballpark lightly, but this is one of those cases where this film should be avoided at all costs.