You can criticize absolutely anything, you can even criticize those baby shows that are just about learning how to count or your ABC's. But you need to adjust your criteria for criticism per product with the one common denominator being: Is it doing what it wants to do successfully?
Does a romcom successfully make you laugh while you watch two characters that you like believably fall in love? Does an adventure movie get you engaged in the character's journey and world? Does a kids comedy effectively make you laugh? Does a pre-school show effectively teach lessons it's trying to impart? Adults are ones who make lesson plans for kids to begin with, so you should be able to spot whether it does or doesn't based on your own knowledge and experience.
Daniel Tiger is really good at singing songs to teach kids good habits. Mickey Mouse Clubhouse tries to do the same thing but kind of fails because it's so focused on adventure and being funny, that you're no longer watching the show to learn how to clean up your room. You're a kid watching specifically to avoid cleaning up your room.
The problem is a lot of people will criticize kids cartoons for NOT doing things. For example, complaining that in Ducktales, there is no threat of death is nonsensical because it's a lighthearted adventure show where no one has yet to die. But it's valid in Steven Universe where characters HAVE died, so that consequence is on the table.