One Ocean is one of the best SeaWorld shows - it's educational, inspiring, and theatrical. I felt it really led to a significant connection between SeaWorld visitors and the animals. Sadly, the organization has chosen to get rid of this show. I hope you had a chance to see it before they discontinue..d it.
We all grew up on this kind of shows, but after the documentary movies - it's a bit hard to review this attraction. If you must go see that, I think the children will enjoy the effect of the splashing water on the audience and just see this amazing creature 'flying' in the air and swim so smoothly.