It's more the content of MK's Rivers that is the worst version of RoA. Disneyland's has more to see on the back half that can only be viewed from the boats (a lot of MK's are hidden by overgrown trees), there are lots of different transportation options on the river and at night it transforms into a nighttime show.
Except they butchered it into a Pirate Island for a good while of its life.
MK's ROA used to have a good amount more. No Columbia but it did have more.