This adaptation of the comic is surprisingly faithful. It tinkers with the plot a little, as it's tricky to get that much of a run of comics onto the screen and there's a bit of a change to the way some of the characters are portrayed, but it's all for the good.
The tone, atmosphere and overall feel of the programme is spot on though. It's a delightfully miserable world, with some really horrible people with taints of goodness, and those who hold themselves to higher standards doing some horrific things. (Looking at you, vampire-sitter.)
That moral ambiguity does play nicely into the feeling that everybody should just be put out of their misery, but manages to skirt the line of depressing. A good series. Can't wait for the second.