A few thoughts: From the giant floating stone head that drops guns and ammunition on barbaric religious zealots, to the bizarre and terrifying society created by Immortals who punish wrongdoings with old age and an eternity of senility, this movie paints a complex picture that - at times cold in its exposition - is as comprehensive as any movie of its time. Though it definitely takes a while to get your head wrapped around all the concepts and world-building, the result is a unique and immersive sci/fi experience. Sean Connery, with his ridiculous red banana hammock and 2-foot braid, doesn't offer much to the movie as far as a performance goes, but his entire character is really nothing more than a plot device and means to pass knowledge onto the audience without mind-numbing narration. He also represents the clash between chaos and control, in a movie that offers a utopia with more flaws than visible benefits. Sadly, the ideas significantly outshine the execution. Cheesy at times, but always interesting, surprisingly deep, and intellectually stimulating.
Who would I recommend it to? People who like their sci/fi a little heady, or anyone who wants to see Sean Connery look like a half-naked clown.