hi guys,
alien at its core is a slasher/horror film set in a sci fi environment, the thing that sets it apart from most movies of the slasher/horror type is the characters are believable and portray a real sense of fear, they also dont make all the silly cliched mistakes that protagonists do in those other type films like as in "oh, ill just run upstairs and lock myself in a bathroom with a small window where theres no chance of escape".
so what i feel sets it apart is the realism, characters react and do things as i would expect in the real world which gives the movie a real fear factor, also the alien character was basically turned into dumb cannon fodder in aliens whereas it was portrayed as very smart, cunning and almost invincible in alien.
thanks
rich