Cafe Lalibela is the best (of a total of two) Ethiopian restuarants here in the Valley. Tina's closed before I could get there, but Lalibela's food is on target.
As a vegetarian, I can only review those foods, but the veggie wats are flavorful, spiced right and completely filling. The lentil wats are delicious, and the lunch sampler earns you three different wats (servings of various dishes). The injera is really good here, and you must ask for more if you eat forkless, as Ethiopians do.
The waitstaff is very friendly, and attentive. They're always smiling and patient, and I got to know them a bit when I worked in Tempe.
For lunch, get the (I'm giving my favorite secret away) spiced iced tea. They'll brew it for you cold, and it's a refreshing, herbal way to complete your lunch at Lalibela. For dinner, I prefer their Ethopian beer, which is one of the better Middle East/African beers I have had (blanking on the name).
Take friends or family here, and share a giant platter together. Get your hands dirty, sop up some wat with your injera, and have an experience here.