The biggest problem was as Ryll (I think) pointed out: they answered what wasn't important and left out what was.

So what's this new being that came from the Izanami meeting that world organisations tried so hard to avoid? We got a 2 second glimps of it.

All 12 episodes was arguably focusing on that one point, and that's all we got.

It wasn't exactly the doomsday ending everyone feared.

Meanwhile, we got a conclusion to the Pavlichiko family affairs, which when compared to the bigger picture, hardly matters.