I´m desensitized for usual lame violence like Friday 13th remake. But if movie puts violence/gore in correct way, usually in connection with something I have to think about or feel with character, then it works. Great example of this is The Fly (Cronenberg´s) - Goldblum´s metamorphosis into degenerated mutant with falling-off teeth, nails and body parts. He is basically ill there and we watch his path to doom, it makes the scenes sick in correct way. Or another example - (again Cronenberg´s) Eastern Promises - fight scene in sauna, again powerful one, because it´s not typical lame "showcase" violence from Friday or Halloween remakes.