We ate at Coral Reef this past Sunday, May 30 with a 4:25p ADR, and it was one of the best meals of our trip. We waited about 15-20 mins to be seated, but that was because we requested a tank-side table.
My seasonal catch (swordfish) with mushroom and scallop risotto was hands down the best dish I had the entire trip, and my wife cleaned off her plate of the rainbow trout with warm salad of white beans, arugula, bacon, and tomatoes. At $21 for the trout and $27 for the swordfish, it's not cheap, but not out of line for what we would be charged for comparable dishes at home. (e.g. At a local restaurant "Grilled Atlantic salmon, mushroom-asparagus risotto, English pea puree," similar to CR's swordfish dish, is $27)
Yes, the restaurant is dark, and yes it's loud. But our server (Jim from Fond du Lac, Wisconsin) was very nice, and service was well paced. Maybe we lucked out due to our early ADR slot, but Coral Reef was the best meal of our trip.