I lived in the Los Angeles area for about 17 years and lived in the San Diego area for about another 4 years. I consider Tia Juana the best Mexican Food Restaurant in the whole LA metropolitan area and one of the best restaurants all together. It is not just the food, which is delicious, but also the ambience, created by an staff of people (beginning with the owner) that dedicate to make your visit there an special moment with great service, plenty of smiles, and of course great margaritas). I presently live in Arizona and make monthly trips to the LA area and I never miss an opportunity to have lunch or dine there.
Pros: Great food, friendly atmosphere, not far from the ocean.
Cons: It can get crowded on weekend nights