I found this article interesting and agree with many. I will never agree on La Mexicana though I only went there once, but that was enough.
I guess I don't get to many out of town visitors unless mom drives over from Sugar Land. But if I did, I'd probably take them to Little Pappasitos, London Sizzler, Churrasco's, Fung's Kitchen - those places with fun and local ambiance and consistently good food.
Where do you go with visitors to show off Houston's food scene?