We opted for an upgraded Machu Picchu package that included this buffet lunch at Sanctuary Lodge, located just a few steps from the MP entrance, and boy am I glad we did.
Not sure what others were expecting, but considering it's the only (I think?) viable sit down lunch option without having to suffer through an insanely long bus line and go back down the mountain, they could've offered a lot less value. Instead, I found the buffet to be well-stocked til the end (we came late and didn't leave until almost 3pm) with a wide variety of meat and veggie dishes, as well as desserts, and even a carving station. There should be something there for everyone to enjoy (no not Michelin quality, but solid nonetheless).
I do wish however that they had a bigger bathroom - two stalls in the women's restroom is WAY insufficient for the number of people at the restaurant at lunchtime. Otherwise, the only downside was my eating way too much and barely making it back up MP ...
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