Simulator good in general. Also you shouldn't expect great piocture from mediocre hardware here. For 4K picture with decent frame-rate and ultra setting 3080TI or 3090 is _minimal_ card. 4090 is better solution in future (at the moment there are no big difference, just check outube tests). Anyway if your display is not g-sync or g-sync ultimate you will see frame brakes apart while you moving your virtual pilot head not great, but no good. In most of places around the World you will have 40+ FPS with 3080TI or 3090 cards.
But, mention all above. And also not very realistic vegetation in tropical countries... And also not full simulated cockpits in airplanes... Anyway, it's still best (and only good another to spend for good joystick, throttle control and pedals) simulator in market. Also, it still improving... But sometimes developers ruind the game for a while (just check other comments). So, best strategy here - disable auto updates in Steam and check updates manually (developers roadmap is available and published on their site). Wait for update. Wait for review in next couple of weeks, and if there are no scream to the havens about some issues, install it.
p.s. Overall it's best in the market. So, compare to other sims it's definetely 5 star. But keeping in mind glitches, unrealistic tropical vegetation. Unrealistic buildings in poor countries and regions... It's probably a bit less than 4. I will mark as 4 and will wait for better. Maybe will update my mark one day.