I wouldn't choose Brown Derby unless its a place your really wanted to eat at. The Fantasmic perk alone isn't worth 2TS.
We chose Hollywood & Vine. Our 5yo was very comfortable there and very engrossd in the kids activity sheet. We had a good meal, nothing special and probably not looking to return. More of a been there done that syndrome. I will compliment Brenda our server though, she did a great job.
Mama Melrose didn't appeal to us as vegetarians. I thought the variety of a buffet was a better fit for us. However, read the reviews/comments and decide for yourself. Some love it, others didn't care for it at all. Same will be said for H&V. I have no problem suggesting H&V, just don't have any special expectations for the food. There is plenty to chose from, its hot and fresh and tasty, just not special or memorable.