What is it that makes a good diner? Grease? Lucky's has that. Kitschy memorabilia? The walls are groaning with it. Quirky neighborhood characters? Ever been to the Oak Lawn Halloween Parade? 'Nuff said. In other words, you'd never guess that this friendly retro joint is run by Consolidated Restaurant Operations Inc. (could you find a more impersonal name, please?), the company that runs Cool River Caf? and Cantina Laredo, among others. Still, the pecan French toast is enough to make you forget your money is going to the suits.