It's rather pandering material in its juvenile comedy and teenage-esque, smartass wisecracks. The serious tone of the first, and the dark-humored tone of the second, is forsaken for Three Stooges-style humor. Even when watching it as a parody of itself, there is a feeling that it had to be a easier-taken opiate for the masses, when I wish it was as repulsive for them as heroin. That said, I still laughed enough.
Raimi's third in 'The Evil Dead' series always seemed a compromised affair that failed to provide any of the horror the first two entries contained relying more on its comedic elements. It's a fun film however especially with its traditional mix of effects that stand in tribute to Ray Harryhausen.
7 - "Evil Dead" meets "Monty Python". Many would argue that at this point the series became a full-blown parody of itself, and I'd agree, with the addendum that it absolutely succeeded in that endeavor. "Army of Darkness" is both the loving tribute the genre (and the decade of excess) deserves and the fitting closing chapter the series needed.