When I think about what marine engines were good or bad, there are not many on the "bad" side. A Seattle Co I worked for had a tug with a Bessemer Cooper, direct reversible, everyone freaked when they had to go to Alaska on that boat
The rest of that class of boat had twin screw with V16, 149 Jimmies. (fine engines, for simi desposable) Allot of the boats had the medium speed Cats up to the 399D, of 1600 HP, Had a 398 lose a turbo once, but point is, I maybe can count on one hand the times I have been broken down due too the actual engine having a problem. I didn't generally work for crappy companys tho, Its scary enough on good boats

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"