What makes the Evil Dead franchise stand out?

You know what I’m talking about, Evil Dead with Bruce Campbell. From the first movie to its third installment, Army of Darkness, they were, and still are, revered as fantastic movies. Despite controversy, especially in the first ten years of the first movie, they stand out among fans, which might be a greater legion than all Deadites.
I have my own thoughts about why it stands out. I need no conviction, but after watching all three recently, (And having a damn good time of it.) I am very interested in the opinions of fans and those who are otherwise familiar with this. Haters chime in, too. Your opinion is just as valid, and I won’t treat it any differently than another.
Why does this franchise stand out? Freaky camera work? Over the top gore done with intriguing special effects? Campbell? Is it creepy? Funny? What?
Gimme sum sugar, baby.