I have owned lots of cars...75 and counting in my lifetime, about equally mixed manual to auto. For me, driving the manual adds an amount of sport to the driving experience such as in my many years in the Italian and German Alps....awesome in a highly modified C5 6M Corvette. The Vette quickly and easily revved to 6500+ RPMs and downshifting to engine brake the car (mostly to hear the exhaust) while slowing for a 90 degree corner was simply awesome and fun. I've driven at least 20 laps of the Nurburgring in Germany with 173 corners in 13 miles at greater than 165 on the straights. Yeah, that's what "driving" is all about. However:
If anyone thinks your going to experience that kind of driving fun in a stick shift 4 cylinder diesel, ...think again. With a red line somewhere in the 4k RPM range, and an exhaust note much like a muffled trash truck, it will be anything but fun. It may make some feel more, well, um, MANLY...but it won't be fun. The 1.4 liter Eco with a manual IS entertaining, but the diesel Cruze with a manual just wouldn't be. For those that want the manual for a minimal improvement in fuel mileage, that seems a reasonable rationale...go for it. I will enjoy my Cruze 'til trade in time for what it is, a very comfortable, nice driving economy car.