It can be. Basically I think the more children under 10 you have, the better a deal it is.
And if you want to have one table service meal per day, and if you're not at a buffet, you would normally order an entree plus dessert at every meal (table and counter). Some don't want to commit to meal reservations every day. Of course, next year there is a counter service plan which will take care of that.
That's for the basic plan - if you want more than one TS meal every day it's time to check out the deluxe.