[0] Though maybe that's just the hilarity of finally finding out who/what Enoch Root is after 4 books and many thousands of pages.
His real turkey, to me, was The Rise and Fall of D.O.D.O [0], although he wasn't the sole author.
[0] https://en.wikipedia.org/wiki/The_Rise_and_Fall_of_D.O.D.O.
For Seveneves the roughest part for me was actually the end of act 1 with all the mistakes you could see a mile off and act 2 had a lot of really fun stuff I won't mention for spoilery reasons but the adaptation of the whip and chain stuff that came up win act 1 was honestly a lot of fun for me.
Yes, there was some superb world building (notably the space habitats and transportation, as you suggest) in act 2 but (unfortunately) I felt that the plot didn't match it.