I actually base my selection of restaurants on the health inspection stickers, the ones with the scores for everyone to see. Well, that's not the only factor when I choose a restaurant, but if I see a sign with a score less than 95 percent then I'm going to have second thoughts.
The thing is that I know the score doesn't tell the entire story. A restaurant can lose points for a variety of reasons and some violations are worse than others. Still, any score below 95 is suspect to me.