Taco Shack is pretty legit!
I've gone past this place a bunch of times for ~6months since I play volleyball nearby. Never did I think about stopping by until I moved to the neighborhood and walked home with a deep hunger in my belly that only tacos could fill.
The inside doesn't scream "tacos!" other than their Hispanic-ish menu (has some random American foods as well)- looks very hipster-modern in shades of black and gray. Parking is in the back since the front faces McKemy & University, with some patio seating along University. If you're feeling lazy, they will deliver within a 3-mile radius for $3, but the minimum bill amount is $12. Not a bad price for tasty tacos!
Both times I've gone I've gotten just tacos- definitely dig the barbacoa and carne asada! Tacos cost $2-3/per, and they also have burritos, chips & salsa/guac. They don't necessarily have chips & salsa, but will give you small cups of their red and green salsa. Both are crazy hot/spicy!! The green is a bit smokier tasting than the red from what I could tell. Wasn't terribly impressed with their guac as well- tastes and appears just like what I could make with Fry's mix and 2 avocados. If you check in on Yelp, they're supposed to give you an order of churro's. Didn't happen when I tried the first time, maybe next time they will honor it.