We visited Crayola with three kids, ages 11, 8, and 2, and all three had an awesome time. There's an incredible variety of things to do, ensuring that everyone was able to enjoy themselves. The space is clean and well-maintained, and I think the most amazing aspect of it is that it provides kids with an opportunity to try just about every product Crayola makes without charging their parents through the nose for the privilege of doing so. Each visitor gets tokens that can be redeemed for various Crayola souvenirs like a small package of crayons or a ball of clay (which I'd never have actually bought for my son, but we ALL had fun with it so consider me sold on it!). It's self-serving, of course, because they want you to buy their products, but they are far from stingy with the materials and everyone will leave with a big bag of souvenirs.
My only quibbles with the place are that the snack bar is pretty subpar -- everything's either greasy and bland or packed with sugar (thankfully, you can eat lunch in the food court at the mall and come back) -- and we would have liked to get more photos with the crayon mascot, who showed up two times over the course of the day for about 20 minutes each time with no announcement.
Bottom line, we could easily see ourselves coming back on our next visit to Orlando, especially if the weather doesn't cooperate with our park plans.