That cargo door is a winner! Trumps every other negative - your back will thank you. Try squeezing a 200kg patient on a Lifeport stretcher through a L35/36, DA200 or C550 door - that will be your Eureka moment.
Its all too easy to find fault with range, speed, gravel strip capability and SL cabin limitations. There are heaps of aircraft which can do somethings better but none have that door.