The fan base definitely over hype the manga, but many good things are enjoyable.

Story: 7
It started interesting with the main Character Eren trying to Kill all Titans to take revenge for his family's death, in the process he discovers he can turn into a Titan. Throughout the story, we discovered that there are as many as 9 shifters (shifters being people who can turn into Titans). After a time-skip many secrets behind the titans are revel.

now I like how the story proceeds until the time skip point, from that point on the story, goes downhill and I'm sure the author has a good reason to makes those changes but they were not appealing to me. And there are a few asspull that you don't see coming.

Art 10
The art was outstanding, very different and unique. It is very sketchy looking but the images have a great amount of detail. It captures the action of the characters very good, it doesn't feel stiff. Overall, I think the art style of Shingeki no Kyojin is suitable for the story to come to life.

Character 9

There are a few characters well written but the main character is not one, secondary Characters have a better reason to be part of the story and others just feel dry.

Enjoyment 8

while some chapters are interesting and make you want to read more, others are plain boring and confusing, its very hard to get into it at first because of the first volume it's just information and backstory but once the action scenes hit its very hooking.

overall 8

I feel like the story is overly hyped because there are better Plots in other Manga, but it's still very enjoyable and addictive.