How realistic is SR2 physics?

Most of the time
8/10
Sometimes when your landing gear breaks and that force sends you into orbit. (yes that actually happened)
1/10

I have to say, the more I play this game, the more I admire how accurate it can be, ex. a few little things like gyroscopic precession, and in some of my early rocket designs being acquainted (and educated) with the rocket pendulum fallacy. Aerodynamically this game hits some important marks, as your aircraft will experience adverse yaw and will suffer if not designed correctly (ex. CG aft of center of lift), requiring you to make full use of ALL flight axes (pitch, roll AND yaw).

To be fair, no game is perfect and this game is no different, as there are still a few bugs to be worked out and some inaccuracies (whether they're there by design or omission I'm not sure), but the game is still in early release, and the Devs are open to suggestions and do a great job keeping an eye out for bug reports.

That said, if you are concerned about inaccuracies, play the game and help by making suggestions on this board, in general suggestions with high count of upvotes can lead to changes or additions made to the game.

It has no N-body, water buoyancy is a bit weird and aerodynamics have some problems, but it's far more realistic than other games.
With moving parts you can make cables that behave like cables, the collisions work amazingly well, so you can replicate mechanic systems. New rockets add a lot of realism with exhaust expansions

7/10 Considering that its not using N body

in 100% honesty? I'd go for about 8/10. Definitely more realistic than other games.

heck I don't know