Finished watching Shinsekai Yori.
It was excellent. Then ending was good as well. Like any show it wasn't perfect, but I'd honestly put it in the highest tier of stuff I've watched.
It's a solid 10/10. It moved me, it amused me, and it kept me at the edge of my chair for the majority of the sitting.
The characters had no particular annoying traits, seemed realistic, and the major characters had deep personality traits. Like any good show (imo) the villains turn out to have a perfectly solid reasoning for their actions, and I was able to emphasize with them quite well.
The plot was set in a post-apocalyptic dystopia, which always needs some good justification of how the situation came into being. They did this well without hindering the plot, or seeming unrealistic (i.e. giving room for huge plot holes)
The art was top notch. They eyes were a bit too diabetic, but it didn't really bother me at all.
The plot was good. It had a clear and constant pace and covered a lot of ground; it was paced perfectly for a 25 episode anime, a lot of stuff happened but the pace wasn't so high that too much detail was lost or confusion was caused. The beginning may have been a bit slow on the other hand.
It had some interesting themes, and caused a good amount of tension. Unfortunately, some of the tension was horror-like (i.e. like the one you feel in horror movies), which to me always feels a bit forced; kinda annoys me when watching it, but it was only prevalent for 2-3 episodes.
The ending was good too. I wasn't really left with any burning questions, and there was no Deus Ex going on either.