I actually really love this place and the service is great...until we got the bill for a group of 6 and gratuity was already added (18%, which i don't mind because I would have tipped 20%).
However, if you're going to auto grat a group it's a good faith practice in the industry to let inebriated guests know that the tip has already been added and that you thank them. I want to believe (based on how nice the servers were) that they weren't trying to be sneaky and get tipped on top of the tip already embedded in the bill, but it's easy for customers to feel duped when businesses don't let you know that it's there.