I really liked Seveneves, but totally understand why someone wouldn't like parts of it. I am curious as to which third you skimmed though as the book is effectively three different books with very different moods.
The first third is very intense, I also was a bit fatigued for that middle third. When I have reread Seveneves I have skipped it. I really like the last third, but it does feel like a completely different book.
