In my opinion, Attack on Titan is, in general, a bit of a messy store with boring main characters (but interesting supporting ones) held together only by an interesting premise.
To that end, Eren was more than just a little lackluster to me. I got tired of seeing his face, predicted every majore plot point that happened to him and just generally wanted to punch his face in. He is generic, as so many have said, and that isn't nessecarily a bad thing. It can be good if done well, but unfortunately, the generic character he was elected to be is one of the worst ones and was not helped by bad writing, in my opinion.
He has good reasons to do what he does, but that doesn't mean I have to enjoy it because it's just so overdone and boring. Many of the supporting characters are much more interesting than him, and honestly, I'd rather watch a show about any one of them over Eren any day even though, really, there were too many of them introduced straight off and I still can't keep them all straight (nor do I care about them). Like Annie. I mean, I only vaguely remembered who she was before the major reveal of shit, but can you imagine a story about her? That would be much more interesting.