This has to be one of the most beloved cult classics of all time and I believe that Bruce Campbell has a career almost entirely because of the character Ash.
Like most people, this movie managed to pass me by when it was in theaters. I had no familiarity with Evil Dead 1 or 2, most likely because of the R rating and I was in elementary school. However, it wasn't until many years later that I discovered The Evil Dead trilogy (of sorts) and I loved them immediately.
While the 2nd Evil Dead kind of got the ball rolling in transitioning from a serious gore-fest to being considerably more whimsical, Army of Darkness went all the way. It is more of a comedy flick with some gore and a few jump scares mixed in than it is a horror film. Ash's brash and cocky method of speaking and handling situations became legendary and his attitude and confidence is very different than the Ash that starred in the original Evil Dead.
Some of the special effects, particularly the actual Army of Darkness that attacks are pretty bad, but director Sam Raimi wasn't get getting hundreds of millions of dollars to make films yet. This one had a budget of 11 million, which I personally think was very well used because given the relatively low budget, the special effects are actually quite good especially when you consider the fact that the film was made in the early 90's when technology was a bit limited.
I don't want to get into too many opines here because since this is a cult classic people get easily butthurt about the specifics of this film. The movie has a little bit of everything though, and I think that really appeals to nerds like me.
I have seen this movie dozens of times and it stays entertaining to me every time I see it. I really enjoy sitting down and watching it with people who have never seen it before to gauge their reaction. I normally get my feelings hurt if they don't find it funny - Cult classics have a way of doing that to the fans. If you haven't seen this film, you really aught to because for an "army" of people out there, it is a fantastic piece of "horror" history.
The film made $25 million at the box office and over the years via DVD sales and remasterings and merchandising it has likely made much much more.