This show isn't Doctor Who but then again, it's not supposed to be.
This isn't a show about monsters, regardless of its monster of the week format. It's a show about the blemishes in humanity, the mistakes and the compromises that we make as a deeply flawed race. The monsters aren't the things that the Torchwood team chase; I'll let you guess what the monsters are.
This show brilliantly explores the other side of Doctor Who. While Doctor Who shows the brilliance of humanity and its ability to overcome adversity, Torchwood shows the cracks in the vaneer. It shows the dark side of the human face and makes sure we don't like what we see--while doing it in a very compelling fashion.
We see a very different Jack in this show to those who are familiar with his presence in Doctor Who. Less carefree and feeling the weight of the world, we follow Jack as he leads an essentially selfish team that is charged with selfless work.
The show takes on more adult themes and more mature ideas and doesn't resolve them in happy, tidy little bows. The story telling is more nuanced and shades of grey permeate every choice that the team is faced with.
This isn't a show that leaves you feeling happy at the end, it's one that makes you think.