Yep; I'm one of those people, but not for the reason you might think.
The fact that the Internet anime community (both longstanding members, and new ones) have fallen in love with Attack On Titan, and reasonably good reviews from several critics made me want to check it out.
When I did this, I wanted to be as fair as possible to it, so I decided to experience it in my favorite medium: the hold-in-your-hands, smell-the-ink tankoubon. This is definitely different from the fans, who have probably seen the anime in high definition, with its' explosive action scenes, but I still got the same effect: I wasn't feeling it.
The main reason for this was the biggest part of the series: the tone and the violence. Before you slam out a "You're just a pussyf@gg!" comment, let me explain: I have no problem with violence, or dark tones being used in any work of fiction, as long as they are handled well. For me, handled well means that they are not the central focus of the series, or used to manipulate me into feeling shocked, or sad for the sake of being sad.
Attack is not nearly as bad about this, as some other series (i.e. Chaosic Rune, Gantz), but it still seems to be there; the violence and depressing things that go on are not balanced out with interesting scenes, concepts, or something else that takes the edge off what is happening. That seems to be the biggest issue: the series is mostly edge.
One thing I keep in mind is that watching the anime would probably enhance my experience, because of the HD action scenes; the factor that is the anime's main selling point. In the manga, however, battles are not drawn or executed well; with all the zipping around and quick movements that are done, it is hard to keep track of what is happening and who is doing it.
My point is: I do not think that Attack is a bad series; it just doesn't hit on the areas that I need darker, more violent series to be able to enjoy them. Series, like Berserk, or any installment of JoJo's Bizarre Adventure are able to have extremely dark, or depressing themes, but have other factors to them that keep those themes from overshadowing the entire series. However, you may enjoy it for what is there, and if you do enjoy this sort of series, check it out.