I think the majority of users are not having crashes so that may be something with your system. I would try reinstalling the game and your drivers and check for anything running like virus checkers.
I bought the game on release day and have had zero crashes after maybe 100 hours of flying so its possible and not necessarily caused by the game itself.
As for the weather and autopilot, yes there are bugs there. If everyone was allowed to claim refunds if the game has a bug then there would be no games market and certainly no big budget releases like msfs.