I find MS flt sim NOT like the real thing (i fly 737). However, when I look at the actual numerical responses that FS makes to control inputs I cannot fault them.
The only thing I think makes the difference is that when in the aircraft your body feels the results of the inputs you make, also there is a different resistance to your hand inputs. As such, this makes the aircraft easier to fly than the FS, even thouh FS may be technically correct.