Eat there all the time. Outstanding food. Cheap.
If you like real, authentic Mexican food then go to Senor Lopez. Food is absolutely fantastic, you don't leave hungry and you can pay your bill with the change you find laying around your car. It's dirt cheap and really good. I've been there countless times and have never had a bad meal, or even just an average meal. Everything is simply outstanding. Restaurant is small but very clean inside. Service is friendly, and reasonably fast. Go. Enjoy. You'll be hooked.