Stuttgart engineers are putting the years of cost-cut me-too Benzes behind them. Ditto the endless distractions of the Chrysler affair. The 2010 Mercedes-Benz E-Class represents Daimler's contrition for those sins. Like the recent C and S, the new E-Class is a return-path to what people always loved Mercedes for: a solid, safe, comfortable, conservative car in which you can invest utter faith.