Of all the people talking about bad acting or bad story, I'm not sure we watched the same movie. This is a movie with 99% child actors so expecting Oscar worthy performances (I found their acting to be better than average, and 100% better than the really bad movies that are constantly released, e.g. Cheap version of what's about to come out in theaters.)
The premise of the movie was decent; how would kids who haven't reached puberty survive in a world without adults. Maybe others are disliking the movie for it being a female protagonist that is stronger than her male counterpart? Just a guess there, anyway....
There are a lot of routes this could go but this movie decided to somewhat focus around an amusement park. It didn't seem to be a primary focus of the "Neverland" the plot description implied so it kinda failed on that route. Regardless the movie does a good job of portraying a world where per-pubescent children have to survive. I enjoyed it and very much was not a waste of my time.