My opinions: interesting and enjoyable atmosphere, slightly above average food, and costly. We went at lunch, and it was simply too much money for lunch. The portions were good-sized, though, if that justifies the cost for you.
Keep in mind that there other Rainforest Cafes out there in the world, and the food is similar to other sit-down chain restaurants. If you are looking for adventure in food, try one of the EPCOT restaurants or Boma or Jiko. If you are more interested in an entertaining and unique atmosphere and decent food, go to Rainforest Cafe.