I agree Estrid. With all the loose ends, and the Ellemist Chronicles. It didn't even mention the Time Matrix, which was one of the key things we knew about the guy early in the series. Then you have Crayak, whose methods in 26 kind of make sense, but then he just becomes something less interesting who wants to destroy life just because he can? And she just handwaves how Crayak came to the same state as the Ellemist, and why the Ellemist didn't imprison him or something before he even got the chance. I understand not going into the past to destroy Crayak before the Ellemist became entangled in the timestream, but to just sit there while Crayak finds a way to duplicate what happened to the Ellemist?
There are many things wrong with the ending, big and small. I just posted in another thread where someone wondered if she became out of touch with her fans near the end, and I said no doubt about it. At all.
16 things listed in that poll, and that's not even all of them!