Well I read the manga because I finished the 1st season of Attack on Titan and was bored out of my mind.
The story line does take detour from what we would generally want (Mindless hack and slash ) but its pretty decent to where the story has reached and wouldn't be surprised if there is any further development.
The only reason I hate this anime/manga is because Eren always acts like a little bitch for no reason at all.
I really hope we get to see some good action after the 84th chap that i am currently on.

PS: Mikasa and levy are the only reason i read the manga because they carry Eren's sorry ass most of the time.