Nazca has some wonderful food. I was amazed at how authentic it was having lived in Peru for a couple years. There were several positive aspects that I experienced during my visit to Nazca but I am afraid that the cons outweigh the pros.
I had the papa a la Huancaína, pollo a la braza, and Inca Kola.
Portion size to cost ratio: this was easily one of the biggest disappointments that I had. When I read "papa a la Huancaína" on the menu I thought it was a typo because I could not fathom one potato costing $9. When it arrived I was so surprised to see one of the smallest potatoes ever on the plate.
I ordered the 1/2 chicken and it compensated for the small papa. My wife and I split it.
While I lived in Peru I ate cucumber, tomato, olive oil, and lemon salad every day. It was a favorite. If I wanted to have that at Nazca it would cost me $9... For tomatoes and cucumbers!? No thanks.
Selection: this was a huge let down for me. I was hoping to have tallarines verdes and some jugo de maracuyá but neither was on the menu.
Summary: overall I loved the food at Nazca. It was delicious and very authentic. The only thing that wasn't authentic was the price. Maybe I'm just used to having Peruvian food for less than $5 but my main suggestions would be to add at least 2 more potatoes to the papas a la Huancaína and add a few menu items while making the prices much more realistic.