There is a new anime in town - Attack on Titan
I love this anime already even though it is not finished yet. It kind of reminds me of Claymore anime.
You get fast paced action, plenty of excitement in a roller coaster ride.
You follow the main character Erin Yeager and human's struggle against the Titans, who forced humans to build walls to protect themselves from getting eaten, until one of the walls are penetrated...
If you want to watch it, you can check them out at Attack on Titan anime.