When I was in the film group at the U of MN, we used to show the Evil Dead trilogy every Halloween. Evil Dead always got the most drunken heckling and then the audience would settle down and enjoy Evil Dead 2 and Army of Darkness. Tonally the movies are actually quite different as Evil Dead is one of the quintessential "cabin in the woods" horror movies (which are basically due to the fact that this is the best location for a filmmaker with a limited budget - and horror movies are usually better sales than other genres).

Evil Dead 2 is a Three Stooges film (Raimi came up with the term Fake Shemp during the filming of Evil Dead since he had to keep hiding the fact that his actors couldn't make most of the shoots) and Army of Darkness is a sword-and-sorcery adventure.