I think if our only metric of success is that it’s a “good kiddie land”, then it only seems fair to compare it to other kiddie lands.
Fantasyland, the original kids land, has 5 dark rides, 2 “flat rides”, and 2 boat rides at Disneyland. None have a height requirement. It also has a family coaster with a height requirement. At Magic Kingdom, there are 3 dark rides, 1 3D show, 1 boat ride, 2 play areas, 2 flat rides and 2 family coasters. All of these cover a wide variety of IP.
Now let’s look at Toon Town. Weaker than it was at launch, Toon Town still has quite a few play areas (with the park and all of the houses), a good dark ride, and a small family coaster. Pretty decent theming all around too. It’s also getting an update with more play areas, and a new dark ride.
Now going back to Toy Story Land. There’s an arcade shooter dark ride, a flat ride with a height requirement, and a family coaster with a height requirement. The only thing that everyone in the family can do for sure is the shooter, and even then, it is possible that some kids might be too young to properly grasp the controls. For young babies/toddlers, there’s nothing in this land for them. No play areas. No shows. No all inclusive dark rides.
Even the failed Bugs Land was better at being a land for young children than TSL. 5 flat rides (one of which played out like an outdoor dark ride), a play area, and a show (that admittedly would scare some kids).
Dinorama, a worse land than TSL, still has more for young kids to do with Triceratops spin and the dig site play area.