Food was great. Atmosphere was alright. Service was lacking, but it was a buffet so it did not bother me. They should have just had self service drink stations.
I was in a group of 10 during a work lunch. We all paid separately. Even though it was a buffet, we were still charged an 18% gratuity.
This is just price gouging with a hidden surcharge, as it was no extra difficulty to seat or accommodate us. In fact it allowed for a greater accommodation density within the restaurant. If the cost had been 18% higher up front and not hidden, I would have complained that the price was a bit high but still a 5 star experience.
For poor judgement in trying to cheat their customers, I would suggest complaining to the restaurant about this. Or not going.