The MU-2 has one of, if not the best, safety ratings in its category since implementation of the SFAR. We've had now 9 fatal accidents in 17 years. Yes, that's 9 too many, but it's a testament to the effectiveness of the training program when you look at similar platforms that don't require a type rating.
It's unforgiving of people that don't take the training seriously, don't follow the profiles/checklist, don't understand the airframe, and/or allow its immense capabilities to get them into situations they shouldn't have entered in the first place. No different from any other high performance turbine equipment. It's no more or less unforgiving than any other type-rating required airframe, and the SFAR has shown it's perfectly safe when operated in the hands of a pilot that understand the plane and their own capabilities.
If you ever find yourself in Maryland I'd be happy to give you a tour of my plane and take you for a ride.