Clarke continually revisits the idea that there will be some kind of quasi-mystical ascent to a higher level of being in his writings through some sort of science fiction (usually alien) intervention. This idea is not really interesting to me. I don't really see the world that way and I don't think that is where humanity is heading or even that it is metaphysically possible, so I tend to find all that a little boring. My favorite treatment of this theme is 2001 (the movie) because of Kubrick's influence. I'm starting to find it all a little repetitive. A lot of authors are repetitive of course, but repeating on this is a little dull.
The execution is fine, but I think Clarke is overrated.