At IOA, We usually enjoy Mythos when we visit. It is a great atmosphere and good food. For casual food there, we liked the big circus tent place in Suess Landing - I forget what it is called. But the food was surprizingly good and the portions were huge. Also, Thunderfalls Terace has good fast food and fun atmosphere. And the funnel cakes here are fabulous! They are at a place right when you walk in and take a left to go to The Hulk. Get the funnel cake sundae, you will love it!
At Universal Studios we really liked Finnegan's Bar and Grill. It is a really cool atmosphere the food was great. My husband and I ate at Lombard's and enjoyed it, but we didn't have the kids. I don't think my youngest would have liked it, but she is a bit picky. The atmoshpere is ok, we were seated next to a large fish tank, but if you weren't sitting there, the setting was just plain. Also, it was a bit overpriced for what it was.
At Citywalk you can't miss Margaritaville. It has the BEST food, and the BEST atmosphere. We eat there at least twice everytime we go and have never had bad service or a bad meal. We personally hated Hard Rock Cafe for food, but the atmosphere is very cool. NBA City was pretty good.
At the Hard Rock, We always enjoy The Kitchen. I know others don't like it, but we have always had super service and great food. We have eaten there for both breakfast (buffet), and dinner and enjoyed it always. Also, don't miss Emack and Bolios for ice cream, very yummy. The Sunset Grill by the pool has great drinks (love potion #9 and pina coladas), but the food is just so so.
At Royal Pacific, the Islands Dining Room has a great breakfast buffet. We loved it everytime we went. There is this grouchy asian guy making omeletts - they are fabulous though!! Tchoup Chop has a wonderful atmosphere. We are mixed on the service and food. The first time the food was wonderful. The second time, not so much. It was sort of bland and it just seemed like they were trying too hard with too many elements. The service needs to be improved. I hate the whole five waiters per table, it is just too silly for me. Also, there is MAJOR ATTITUDE going on between the waitstaff. You can tell some of them are ranked higher and they are just plain rude to others. Also, both times there was major group complaining about other waitstaff (it seemed to be the male waiters gossiping about the female waiters). They would be all scowling and saying rude things (that we could hear), and then would come to our table all false smiles and candy attitude. It was quite ridiculous, I think this restaurant needs to clean staff out, get new management and start over. Jakes is good for a drink, we have never eaten there though.
We have never been to or eaten at Portifino, so I can't help you out there. Have fun eating at Universal!
if you would want to go to a restaurants with a great view of a lost continent and a place were the cooks winned a award for there food then go to mythos Restaurant or if you wanted to go to the coolest place in universals citywalk then go to Jimmy Buffett's Margaritaville. 
