I remember being a little kid before Dora aired on TV was a memorable movie called Land Before Time. As a preschooler it grabbed my attention because of the art and story line of young dinosaurs working together as a family to reach the Great Valley. Their journey was not an easy one. Littlefoot had to learn how to be a leader and had to deal with the tragedy of losing somebody he had deeply loved. Cera had pride issues and had to learn to cooperate with others despite her temper. Littlefoot and Cera view points had clashed to the point when they fought each other over who knew the right way to the Great Valley. Their quest for a new home and plan to kill the Sharptooth was a challenge that they had overcome together.
With Dora the explorer on the other hand, that targeted toward preschoolers her journey is simple. Go to three places marked on the map with little obstacles in the way and then arrive at the destination. She doesn't experience great loss or conflicted very much with another person, nor had much challenges in the story that relatable for me. Dora the explorer relies firmly on the audience to move the story along instead of working more with her friends to solve the problem. The positive of the show that's okay is she teaches a bit of Spanish and kind to animals.
That's all I'm going to say.