I was at Universal in March, with tickets I had purchased that included the children's Meal Deal for free. Thank God it was free, because this Meal Deal is HORRIBLE!! Perhaps I have been spoiled by Disney World's Dining Plan, but the choices are so very limited on the Universal Meal Deal, at least for the kid's menu. There are only 3 restaurants at IOA that participate, and 4 at US. The children's menu contains only 3 items at each restaurant. At one restaurant (I can't remember which one at the moment), we couldn't even FIND the kid's menu until we had waited in a long line, and then saw that the kid's menu was posted on top of the serving counter, at the END of the line, but before the cash registers (that part will be important later). When we got to the register, the woman yelled at my 7 year old for getting an adult-sized portion of pasta rather that a kid's meal, but said "I'll give it to you this time, but don't let your mama try to get away with this again". I told her that the kid's menu was not even visible until after we ordered our food, and she screamed "Well then you shoulda come here and asted me what was on the damn thing! I TOLE you I'll give it to you, so quit it!" She then proceeded to lean down right into my daughter's face and yell "NO SHARING! We'll be watching you!"
Not only was the menu limited and the service just awful, but here they have all these yummy desserts in sight, and the only thing my daughter was allowed to get was a stale, overcooked chocolate chip cookie at EVERY meal. I wanted my money back, even though it was free.
I don't know if the adult Meal Deal is any better, but based on our experience, I would definitely recommend avoiding this "deal" like the plague.