The complexity of the simulation and of the damage model is really a matter of faith until you have a way to test what is doing the simulator.
You can have that on some simulators
like xplane and rfactor in a very clear and clever way
xplane:
rfactor 2 tyre consumption and dynamic simulation
that is a kind of complexity that you can compare with the real life simply because you see what is happening in the simulation.
The problem with Cod is that we don't have at all that kind of insurance on the physically correct simulation.
I'm sorry and I would like very much to say the contrary, but for now we have a Physic simulation with huge problems (velocity and ceiling of aircrafts is the very basic of the parameters to judge a correspondance with the reality) and a Damage Model that allows the Hurricane to fly with half wing cut off.
We were promised to have the acrobatic airplane to be able to admire the physic model but there is anything about it more than the promise before of the release.
About the damage model we don't know how it is made and we have not at all any analisys instrument to understand it (I hope to be corrected asap).
It seems that the convergence of the weapons is bugged, but how do we know that the ammo damage is made in a correct way ( or at least with a clear logic on which you can debate but at least you know it)