I have read quite a few reviews of Sharks Underwater Grill. I seem to have an impression of favorable reviews. . . some folks thought it was too costly for the quality of food, others thought it was just fine. I don't believe it's 5 star dining by any means, but I think, overall, the quality is good and there is no disputing the fact that it is quite costly. I would think each adult would spend easily $25 per person and there is a limited children's menu. Depends on what you are looking for. . . something quick and inexpensive or the experience that will cost you more.
You will be able to find food that's just fine without the expense of Shark's Underwater Grill. I remember our family loved Seafire Inn. . . I'm pretty sure that's the name of it. It's near the water and is cafeteria style. We ordered burgers, which were quite good and the price was surprisingly low. Of course we had just been to the Disney parks where you pay an arm and leg for a McDonald's cheeseburger. Our kids had the children's meal which came in a souvenier lunchbox that looked like a killer whale. They loved it too. Our teenagers had burgers as well and were very impressed. I think it was less than $50 for 8 of us to eat lunch!
We plan to eat at Shark's this time. . . if we can get priority seating at the time we need. . . if not, we won't be devastated as we will just go to Seafire Inn again.
By the way, there are quite a few reviews of Sharks. . .you might have to go back a few pages though and dig around a bit. . . try the search as well.
Enjoy whatever you choose.