I've eaten at a lot of really good, authentic Asian restaurants. Yak & Yeti food was decent but nothing amazing. That doesn't mean that you won't have a splendid time, just recognize the food might not be mind blowing.
I really liked the theming of the restaurant though. They did put a lot of time into thinking of how the restaurant could have come to be in how it would look. The backstory is that a wealthy man and his family came into hard times and opened up part of their house as hotel. The Yak and Yeti restaurant being part of that establishment. It is decorated eclectically with both Asian items interspersed with European items from his travels. Make sure you read the back of the menu when you go and keep your eyes open for all the Disney's attention to detail with decorating.
The dim sum basket, fried cream cheese wontons (for dessert), and spiced chai were good. I would not suggest the curry, since mine was substandard.
I still feel the meal was well worth it all told. Have a great time!