I agree w/ reviewer N.T. in that I prefer Blue Nile over Lalibela b/c of the better atmosphere. Given the choice, I prefer to eat ethnic food in the way I would if at someones home in that country. So yes, part of the restaurant's seating is "traditional" and I like that. In fact, Blue Nile also serves more traditional beverages such as spiced tea and honey wine. In fact, if I remember correctly, you can even experience the traditional table hand washing at Blue Nile. So the the entire experience is more authentic and the food is fantastic. I love the fact that the food at Blue Nile isn't American-ized.
Like many other cultures, Ethiopians eat with their hands (not fork/knife). And here's a tip: you're supposed to place food in your mouth with your right hand only.
If you've never had Ethiopian food & you want to try something "safe", might I suggest the Doro Wat. Its (dark meat) chicken simmered in a spicy red curry. So good and a very common dish.
Enjoy!