Unlike the old spaghetti western that culminates in a Mexican standoff between the three antagonists, the 2009 BMW M5 encompasses each quality in a single package--good, bad, and ugly. The good of the 2009 M5 is its race-derived, 500-horsepower V-10 engine, making it BMW's fastest four-door, with a 0-60 time of just 4.5 seconds. The M5 also corners as if it's attached to the proverbial rails and brakes equally as hard as it accelerates.