Our family loves this place
This is a great place for kids...even my 2 boys who are not remotely interested in "the arts" love it once we get there. Our favorites include: Cockrell Butterfly Center (and the insect exhibit adjacent to), the globe fountain in the courtyard, IMAX, Planetarium, the hall of minerals, the paleontology hall and all of the visiting exhibits (we just saw Geo palooza, it was great!)
My gripes are: Only a McDonald's to grab food at (would be nice to have a healthier choice), the place is expensive. We bought a family membership because we go so often and that helps, but they still nickel and dime you for everything. We would probably go a lot more often if it were cheaper. Our last visit this week set me back $150. But, I have to say of all the museums, this one has the most to do and keeps the kids interested.