A lot of the issues stemmed from a lack of experience of AAF pilots of the early '40's in an aircraft with exceptional power, high wing loading and electric props. Experienced instructor pilots were siphoned off for combat billets and came to be at a premium as well, so students who had little experience with a bird that had to be flown fast, at all times, were often in over their heads and behind the plane when they needed to be ahead of it. (Freeman, Mighty Eighth: War Manual)
One issue stemmed from mechanics running the battery supply down during 'prior to takeoff' checks with crews then losing a prop during takeoff where the electrical demands were high; others stemmed from aircraft delivered by the manufacturer without proper weight and balance distribution which led to trim issues...there were a number of teething problems. (Ibid)
The Ijmuiden Mission (05/17/43) damaged the Marauder's reputation but was, frankly, the result of other factors than the plane itself; it performed well but it could not overcome the mashup occurring during the mission that day. (Freeman, Marauder at War, pp. 44-55)
Reading up in the manual, the plane really looks good with--for example--a simple procedure of entering the pattern downwind at 165mph and over the fence at 140; takeoffs are pretty straightforward as well once the proper preflight and performance practices were established, and were then executed.
The loss of Carolyn appears to be the result of a crew which hadn't the necessary experience in emergency situations (which I suspect is what led to the loss of 9-0-9 earlier this year although any trouble in a multi-engine aircraft with low airspeed and little altitude to work with hands the pilot two strikes right out of the gate).
On the Net one will find a comment by a former Marauder instructor pilot who flew in Carolyn and observed that the crew was inexperienced in emergency procedures and thus, in his opinion, an accident waiting to happen.
For my part I've insisted that Esteemed Number Two Son be given and practice engine-out training all the way down to feather (and then, often, all the way down to landing) even though FAA training and PTSs neither require nor recommend such. But I do since one day he's going to find himself in trouble and he'll need to know--instinctively--what to do...and if a 16 year old can manage a twin, most anyone can.
All in all, the Marauder was a great plane; too bad we don't have more of them with us today. I'd sure have no qualms flying one.