I loved this series. The story is very interesting and I will say that there are a few sad moments. Many DC characters appear throughout the series, which I like.
Stuff happens very early and while not trying to spoil anything, I will say that any character could die at any moment. Your favorite superhero could die at any moment and become infected.
The reason I don't give it five stars is for two reasons.
1) Sometimes the faces of the characters look weird to me.
2) Some characters that I feel would have made the story more interesting are already infected when they first appear. I know that you can't have everyone survive but I would have loved to see how some characters would react being in a zombie apocalypse.
If you're looking for a good zombie story to read, then I highly recommend you read this comic.