We came to see the mermaids perform. The bar is in front of the aquarium. There are a few seats right in front, but most of the bar is too far away to enjoy. The mermaids perform on the other side of the tank for the hotel guests, so not much of a show for us but we could see them. We got the Flatbread and a piña colada. They were both good, if expensive. Enough for 4 prone to nibble on.
I'd say if your staying at the hotel or nearby, then go ahead and give it a visit. It's not worth a drive out from the strip, though.