1. ANY chain.
2. Restaurants that have you make the dishes instead of having them designed by an actual professional. If you choose a starch, side dish(es), sauce, etc, then the restaurant really doesn't know what they're doing.
3. Any restaurant that includes a salad as a standard part of your main course.
4. A plastic laminated menu is a clear sign that you should go somewhere else
5. Any restaurant where the wait staff expose a table when changing a tablecloth

That should be a good start.