It is expecting way too much to "just show up" and assume Hollywood is going to provide reasonable family fare at every theater, multiplex or not. They don't have those dozens of screens to give you an equivalent number of movies to choose from.
Try this page: http://www.imdb.com/showtimes/location/55402/movie
And substitute your own zip code -- it should show movies near you, along with their ratings clearly visible. And you can click on the name of movies to get more information about them. You can click "change location" to pick how far you want to travel.
To find what ratings movies really deserve, maybe these two sites:
http://www.kids-in-mind.com
http://www.screenit.com
Thanks. This is helpful.
I saw Batman and really liked it.