A Saudi chicken-nugget chain is having a breakout moment at the world’s fair in Dubai, prompting speculation that it might one day challenge behemoths like KFC and McDonald’s. And why not?... Al Baik might, too. Full disclosure: My one experience of an Al Baik chicken dinner, in Jeddah 12 years ago, was underwhelming.... The friend who took me there insisted it was superior to KFC or McDonald’s, which seemed a very low bar....