His first full length novel, and although I have read none of his other works, I'm sure it is not his best. Otherwise his reputation is sorely underserved.
But while this doesn't hold up a candle to Asimov in literary style (as far as I'm concerned), the plot does start to pick up after 80 pages or so. Which is, admittedly, a rather long time to wait.
First published in 1951, the science is quite dated in many ways, but as the predictions of a Mars colony have not yet come to pass, it still looks expectantly towards the future (although I doubt there will be many Martians).
For terraforming, it doesn't compare well with Dune, but there are times when one gets bowled along with the enthusiasm of the characters. Strangely, however, main character - sci-fi writer Martin Gibson (yes, there is a lot of self-aware discussion, some of it interesting) - seems to show more interest in 'Squeak' the Martian than in his long lost son. But who knows how the mind works.
All in all, a perfectly readable novel, but certainly not great literature nor great sci-fi. Hopefully 2001: A Space Oddessy will impress more. 5.2/10.