Automobile Magazine did a 30 day review of the E300 4-pot. For those still struggling to comprehend what could possibly be less than awesome about the engine choice:
"Let’s deal with the elephant in the room, the engine, straight away. The new 2.0-liter turbocharged four-cylinder and 9-speed automatic combination in the E300 works well in normal driving. There’s only the occasional low-speed hesitation that annoys, when the engine is caught off boost and the transmission has chosen too tall of a ratio. Pushing the Mercedes harder does reveal one other negative. The old entry-level E-Class, the E350, delivered 302 hp from its naturally aspirated, 3.5-liter V-6. Two extra gears in the E300’s transmission can’t hide a loss of 61 horsepower or the slight drone of the four-cylinder engine during heavier throttle applications."