Re: Le Mans and WEC. Yes, LMP1 is a joke. And the GT competition is also quite silly with all the BoP polemics every year which decide most of the race.
Re: Assetto Corsa. No, the new game is based over the Blancpain series. They race GT3 cars (WEC uses GTE cars, which are a bit faster and without ABS). It is quite competitive, but mostly boring, and with very little interest from a constructor/team championship point of view because of various BoPs. I use it---successfully---to fall asleep.