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You have a point, albeit I don't agree. Generally you do up everything in a slasher sequel, but the great thing about the Halloween films(as oppossed to other slasher franchises) in my opinion is that they never just killed people to up the body count. Meyers was maticulous in his killing, as if he was widdling down wood. I think the kills themselves were more violent this time around (buring water scene) which is always effective, but I don't think you need to up the ante neccessarily in every sequel (Hills Have Eyes 2 remake, case in point). That being said i enjoyed the second film, it does what a sequel should do and that is continue the mythos established in the first film. To me it stands out as a great example of how to make a slasher sequel, the timeline is directly after the first film leaving little explanantion of things that passed between films.
Who cares what "reviews" say about a film, ultimately it's all about did YOU enjoy it. Some of my favorite movies are those that are least regarded as being good or even worth watchin.("Freaked" anybody?)