Here's the official series description according to NBC:
Grimm is a new drama series inspired by the classic Grimm's Fairy Tales. Remember the fairy tales your parents used to tell you before bedtime? Those weren't stories -- they were warnings.
Nick Burkhardt (David Guintoli Turn The Beat Around) thought he prepared himself for the realities of working as a homicide detective until he started seeing things he couldn't quite explain. When his ailing Aunt Marie (guest star Kate Burton, Grey's Anatomy) arrives, Nick's life turns upside down when she reveals they are descendants of an elite group of hunters, also known as "Grimms," who fight to keep the balance of humanity safe from the supernatural creatures of the world.
What is this? Fables with some added supernatural 'Twilight' crap? Fuck this. I'm disgusted by how they to rip one of the most beloved comic book series of this era and then make a lame TV series out of it. The trailer above sucks and I'm pretty sure that the whole series will blow.
How can they make something like this and then not make an authentic, high-quality Fables series that we can all enjoy? Fuck damn.