I read Seveneves this year as well but came away disappointed. Some of the science was good (orbital mechanics, genetic engineering) but the rest of the science and engineering was fairly poor[0]. Couple that with the questionable decisions routinely made by many characters and it's a very weak novel overall.

[0] In particular, they did not (and physically could not) have launched a broad enough manufacturing capability for the remnants of humanity to have had a realistic chance of long-term survival. The practicality of the Seveneves themselves did was also at best dubious from a biological and other standpoints.