I've never tried FlightGear, but looking at a couple of videos, it's not even
close. Early sixth generation, maximum. 0 A.D., I'd say around the middle of
the 6th generation, based on the screenshots. Stunt Rally, somewhere in the
middle of the 6th generation.
This is a proprietary game from 2011, which suffered from development hell
which lasted for 15 years:
https://www.youtube.com/watch?v=ZIq0m_d5O5k
No libre game even compares to the level of graphical detail here. As far as
I can tell, no gamer was particularly impressed by this. So this is, at best,
average for a proprietary game released in 2011. And given the sample of
other modern games I've seen footage of, this rings entirely true for me.
I don't mean to devalue libre games' graphical quality. I do appreciate the
visuals in games like Xonotic, Naev, 0 A.D., Kobo Deluxe, Warzone 2100, and
Armagetron Advanced. But unless you're planning on shutting yourself out from
and alienating mainstream gamers, you should recognize that these games'
graphics are nothing compared to what those gamers are currently used to.
