I've been to Rainforest here in Orlando a couple of times, and I've been to the one at Sawgrass once. The food wasn't bad, not as bad as you people say it is, but it most certainly is overpriced. And the crowds, ugh. With so many wonderful choices of dining venues in the Orlando area, with similar food and lower prices, like TGIF, why would I want to wait an hour to pay twice as much.
I might visit T-Rex just to check it out, but I am not a fan of themed restaurants either. Typically sucky food, high prices, lots of noise, and great atmosphere. I'd rather eat at a dump with great food. Now, if I was a kid, I'd be all about these places, especially something with dinosaurs. I was a HUGE dinosaur lover when a small child.