I thought Children of Earth is exactly what I was hoping from the so-called “watershed” series when I first heard about Torchwood. I think Children dealt with a tough issue in an adult way and was insightful in the way government officials might handle such a crisis.
I actually found the 4th episode to be the most depressing.
Even Gwen was less annoying this time out.
Overall, this is what I expect and hope for from speculative fiction. Bravo!