
From the back cover of Bantam paperback December 1990: THE RAMANS ARE BACK... Years ago, the enormous, enigmatic alien spacecraft called Rama sailed trough our solar system as mind-boggling proof that life existed -- or had existed -- elsewhere in the universe. Now, at the dawn of the twenty-third century, another ship is discovered hurtling toward us. A crew of Earth's best and brightest minds is assembled to rendezvous with the massive vessel. They are armed with everything we know about Raman technology and culture. But nothing can prepare them for what they are about to encounter on board Rama II: cosmic secrets that are startling, sensational -- and perhaps even deadly.
And if you do read Rama, don't bother with the sequels/spinoffs. The closes depiction to the feeling I had after reading Rama II has been captured by xkcd in the Matrix strip. [0]
[0]: http://xkcd.com/566/
Unlike others in this comments tree, I liked the other books. These go against the typical space exploration journey where you have humans on their ship surrounded by technology they're familiar with and on which they can fully rely. Here, characters are uncertain of their future - they don't know where they're going, have to adapt to the surroundings, discover the unknown and face downsides of human beings. There's none of that familiar splendor of "going boldly where no man has gone before" or heroic actions, great fights in the outer space. Lee's contribution shows us as small, even unsuited to live among others - here and there.
On the other hand, I'm not fond of his other books where he tried to continue this universe: "Bright Messengers" and "Double Full Moon Night". These felt like distilled, fast-tracked version of "Rama" with more religious overtones because of two characters included.
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Clarke's own books and these which he co-wrote with other authors have potential for adaptations for the big and small screen. "Rama" series taken by good writers and directors could become a new hit comparable to "Lost" show - which if you stretch some things, feels somehow similar.
