I actually got World of Final Fantasy when it first came out, but I've yet to begin playing the game myself.
My four year old daughter, probably 2 or 3 at the time, did play the game. I sort of helped her along, so in a sense I did start my file. I'm looking forward to the day that I start my own playthrough, as I think the art style is amazing, and I really like the characters. The "helper" character, which I can't remember (was it Mog?), has this cute language nuance where she keeps saying the word "the" at inappropriate times (or maybe it's a different word, I can't recall), and while many probably found this bothersome, I really liked it.
I also like the familiar enemies, locales, and variety.
Fun fact: My daughter calls it the "plushie game".
Edit: How was Type-0?
Your daughter is absolutely right. I was just thinking about how Cactuar looks like plushie doll during my last session.
Type 0 was amazing. Loved it to death. I consider it to be the best thing to come out of the Fabula Nova Crystallis series. It takes all the classic Final Fantasy elements and does interesting things with them. It also has a bleak tone that is different from past FF. I highly recommend it.