I was never really into Torchwood. Watched it a bit on and off, but for various reasons it just never clicked.

But when I peeked at Children of Earth I had a serious of moment "... Wait, when did this become Battlestar Galactica all of a sudden?" That shift in tone was a bit abrupt even for us more casual viewers. If the show had spent a season building to that more dark feel, maybe wouldn't have jarred so much. For me at least.