Not convinced it's consensus, though I appreciate that people hoping for something better from the books that are unlikely to ever be written were disappointed by the TV screenplay that most definitely was were preemptively frustrated.

Some of our most popular fiction authors are frequently accused of not being able to write endings - there works are either drawn out way too long, or wrap up way too quickly.

It feels like there's few examples of consensus around what's 'just right' for how fast, and neatly, to wrap up many concurrent plot lines, especially in obnoxiously surreal universes.

Well the final books didn't come out yet so we can't say the movie was worse. I suspect the books will be just as bad because the series suffers from the same effect many stories like this suffer from: The writer establishes many interesting threads without knowing where they lead, and then can't tie them up and the series falls flat in the end. Happened with Lost, with Heroes and many other series as well.