The 5 Series features BMW's new design theme, launched on the flagship 7 Series in 2002. The 5 Series is cast in the 7 Series mold, with a curvy front end, flat flanks with minimal embellishment and a high, flat rear deck with wraparound taillights. It is distinct from the 7 Series, however. We think the design of the 5 seems a bit more cohesive than that of the 7.

The critics claim that, with the flared-nostrils look in front and the chunked-off shape of the trunk lid, the 5 Series seems almost like two halves taken from different cars. In our view, the lines make for a compact package, and that may be part of the problem. Some have suggested the new 5 has the appearance of a well-made mainstream Japanese sedan like the Honda Accord. While the Accord is an outstanding car in its own right, that isn't the precedent one expects for an expensive European job. And either way, despite the hailstorm of comment and criticism that followed the launch of the 7 Series, BMW's new look hasn't seemed to hurt its sales.

Those comma-shaped taillights use another of the 5's new technologies, something BMW calls adaptive brake lights. These illuminate more intensely, over a larger area, when the driver applies the brakes at threshold levels, or when the ABS operates. The idea is to inform drivers in cars following the 5 Series that it's stopping quickly. It could help, but only if the driver following correctly interprets the intensity of the brake lights.