We enjoyed it last summer! Went at my son's request, not really expecting much. We've been to Rainforest several times near home and it's okay. Nothing great, but not horrible. Typical chain restaurant food. We were expecting basically the same here.
We were actually pleasantly surprised. We all had different dishes and were quite pleased with all of them. Felt it was just a step above some of the other chains that have been mentioned. And loved the massive ice cream/brownie dessert thing--can't remember the name. We were seated promptly and our waiter was one of the best we had all week at Disney. He was very attentive, could answer questions, engaged the kids. Just a really good experience overall. Honestly, I didn't pay much attention to prices since we were on the dining plan.
As for the atmosphere, it's LOUD. Anyone who goes in there expecting a quiet, relaxing dinner just hasn't done their homework. That's not the restaurant's fault! But the spectacle of it all is really fun--you just have to go with it!