I can understand why people were bored by this zombie movie
I personally enjoyed the film and the unique take they had with the zombie outbreak. It was refreshing to see a zombie movie where there were still doctors, cops, and working phones!
I find that zombie movies that aren't action packed and filled with gore tend get lower ratings. I love all kinds of zombie movies and while I do enjoyed the ones filled with zombies, I also find the ones that focus more on the living people incredibly fascinating.
That said, if you went into this movie thinking it was going to be like Dawn of the Dead, it's easy to see why you'd find Maggie boring. My advice is if you enjoy the zombie genre, give this one another watch. You might enjoy it a bit more now that you know its not your typical zombie movie.