Story 8/10
Shows and books that use a struggle for survival as its theme often tend to be very good. This was the case with this show. The story did take a very unexpected turn which completely changed the feel of the show (well it did for me anyways). In some ways this made the show more interesting but it was a bit of a letdown for me.
Art 7/10
Took me a few episodes to get used to the art style in this show, personally I thought some of the characters looked terrible and most of the titans did too
Sound 9/10
The first opening for this anime was amazing, the second opening was not as good but it was still enjoyable and both suited the feel of the show
Character 7/10
The main characters all had their backgrounds explained to some degree but we only saw decent character development from two of the characters in the show (Armin and Jean). I have heard people say Eren had good character development but I believe falling into an endless spiral of hate can't be classified as "good character development"
Overall 8/10
Attack on Titan is a great show but I do believe it is a little over-rated. Two of the main characters had terrible character development (Eren and Mikasa) which I hope will change in the second season. However the story of this show will keep you watching and telling yourself "only 1 more episode before I go to sleep" over and over again.