I've been to Copacabana's Adelaide location three times. Unfortunately, every time I've gone it's gotten worse.
The first time I went was for my birthday (April 2017) with a party of five. My first time was fun because of Copacabana's concept of grabbing the meat from the skewer. I also really loved the variety of meat and the massive salad bar.
The second time it was a Sunday evening (late 2017) and I felt like there was not a lot of meats rotating around and the waitresses were less attentive. However, the quality of the food was the same.
The third time I went was for a birthday party (February 2018) for a party of 15 people. The person hosting the party had a reservation, but we waited 15min past our initial reservation time. Once again, the service was mediocre.
My absolute favourites though from copcabana: grilled pineapple, and corn bread.
I think this is a good restaurant to come try once and say you have experienced a Brazilian style steak house.