The first film is for the old-school, I think - it is raw, dark and fairly downbeat.
The sequel lightens things up a lot as you say, with more a slant towards humour making the gore rather comical and less effective than in the original.
It also revolved almost entirely around the hero, and hero-driven horror movies are a different beast. In Evil Dead, it was the things and forces in the forest that were the main attractions.
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