As well as Conan there are some interesting supporting characters, James Earl Jones plays the Snake Cult Leader to perfection. True that the performances are a little over dramatic, but that suits the film's style, it makes everything feel bombastic and larger than life. The little wizard adds a little comedy, but not too much. The only weak link for me is Valeria, but that didn't spoil my enjoyment.
Special mention needs to be made of the music, the score is perfect for the film adding drama and menace when needed. The intro with the voice over and the music sets the scene from the very first moment.
It's also a very quotable film, Conan's prayer to Crom being a good example. Overall I love this film, I've watched it many times before and no doubt I'll watch it many times again. Perfect entertainment.