I too am a true Texan and ate my fair share of Texas BBQ. I believe that the good reviews from others and the top 10 rating for Willy's can be explained more by the lack of BBQ places in the Bay Area than by the quality of Willy's food. Store-bought BBQ meats are significantly better.
The sausages and brisket I had were dry and tasteless compared to what I am used to. I can only guess that they started off with the wrong fat content (crucial for proper juicyness) and spicing, then improperly smoked the meat (do they even have a smoker?), and after this torture, the meat then sat under a heat lamp.
There wasn't anything particularly wrong with the place except for the food, but that is, after all, what I went there for.
Pros: Easy Parking
Cons: Bad Food