Attack on Titan has to be one of the best anime's I've seen this year. It gave me that unique and unusual feeling that Gantz did the first time I saw it. Very different kind of anime, feels much more mature, grown up, lots of emotions and deeply woven thoughts throughout every character. I would literaly be on the edge of my seat during the action sequences and when any episode would end I could not believe I had to wait an entire week for the next one!
Best part is it seems there is going to be a season 2 since there is still a whole lot of things to reveal and answer. Even though every time an answer would sometimes create two new questions with this anime, you still feel satisfied and know that the new answers are coming. I can't stand anime's that never explain anything and just leave you hanging at the end of it's last season. You can tell that the writers for Attack on Titan want to eplain everything and they will but it will take at least a second season to do so.
So if anime is your thing and you have never heard of Attack on Titan then something is wrong with you ;-P but seriously check it out. You won't regret it!