For "od1canod"
First, although we all started entering the flight simulation using the FS development of Microsoft; At present, the simulation of flying is only possible in degree of excellence, through the X-Plane. Keep in mind that this development basically simulates the behavior of an object in a wind tunnel, with all the relative physical properties.
You said it well, the development of the IXEG Boeing 737-300 is an excellent product. In my concept, it is the best product on the market and is still in development stage, which will surely reach levels of realism never seen before.
There is a similar measure for the ROTATE MD-80, also an evolving development.