I don't usually watch animes, with some of the reasons as to why being present in this show. Particularly in the beginning, I was constantly groaning because of the terrible dialogue (at least as far as the English dub is concerned), and just as bad, the exposition, which was blunt and contrived. But this improved as the show progressed, and I found myself able to enjoy the show, save for some occasional head-scratching and/or eye-roll-worthy behavior.
The show utilizes plot devices and techniques that I appreciate, and also makes some slight social commentary. I was at first very much irritated by the show's main protagonist, Eren Jaeger, but this actually serves to set the stage for his character arc, so all is forgiven. The story is set in an alternate reality where Humanity has been confined to life within a network of walls that serve to protect it from the countless slews of "Titans," mindless giants that eat Humans, that roam outside. A "Colossal Titan" breaks down the first wall and causes a large percentage of Humanity to perish in a horrific spectacle, including the mother of the aforementioned Eren, who then declares a personal war on the titans. But, as Eren continues on his self-appointed quest, he learns that the situation is not quite so black-and-white as his convictions...
And then there's Levi Ackerman, who is almost too cool and perfect, but is still Human enough not to be a Mary Sue, and he pretty much steals the show. (And he makes me hot...)
The tone is a bit darker but still maintains that we-can-do-it optimism that is so common in animes, which I hate, but at least in this case it's more balanced. The soundtrack didn't really stick out to me, which might be a good thing. The aesthetic is on point. Overall I enjoyed it, but the show, like many animes, is like a cookie with a few raisins in it: if you like raisins, that's fine, but as for me, I'd rather not have that junk in my cookie. But in any case, the show may not be 100% worth it's reputation, but I enjoyed it, and it's a general recommendation from me; 7.5/10.