Skewered as they've been of late with pink slime, Red China's screams of tainted beef and dire earnings reports, McDonald's recently scored a W in a game global brands love to play: Super Bowl advertising buzz. By broadcasting its new "Lovin'" form of random-act-of-kindness payment during the big game, Mickey D's unearthed a smidge of much-needed Coke-like feelgood currency. [...]