Attack on Titan is one of those anime beginner shows, along with SAO and Death Note. Everybody watches them, and if they are your first anime, you generally think they are awesome, but once you start watching some other shows, they tend to be blown out of the water pretty quickly.
AoT has a great art style, compared to a lot of other shows, and is pretty edgy to boot. Other than that, the characters are mostly unlikable and pretty tropey, and the whole Eren twist kinda put me off the show because I much preferred the whole "us vs them" aspect, and I didn't really think that Eren was an interesting enough character to pretty much hold the weight of the world.
I still need to watch Season 2, but frankly, I cant expect it to be anything else other than more of the same.