It is always good to see BMW on the back foot. Arrogant is perhaps too strong a word; self-confident does not really cover it. Just too pleased with themselves by half in an over-bearing sort of a way is the tone of it. Dr. Norbert Reithofer, the chairman of the board of BMW, was only minutes into his speech announcing the half-year financial results when he felt compelled to drop in that tired old piece of self-acclamation: "The group remains the world's most successful premium car manufacturer." Frankly fellers, is that true?