My buddy sent me an invite. We are both gaming at 2160p and on 1070's. I was shocked at how bad the performance was in multiplayer mode. Texture streaming and stuttering was a big problem. I had to lower shadows to medium, but was able to keep everything else up high to get 60 fps, but with massive dips at times.
Once I went back to SP mode (by accident), the performance issues became minimal! Texture streaming and stuttering went away nearly completely in single player.... 60fps was an easy thing in single player, with frametimes being solid.
I notice CPU usage is incredibly high across all threads. This game wants more cores and high clocks.
The graphics look really good at times, particularly the lighting and reflections. At other times, they look flat as Azix mentioned above. I notice vehicle physics are just poor at times. The car wheels appear to be at 30 hz or something. It looks all wrong.
This game looks really good. It has a lot of potential but it feels more like an Alpha than a Beta. I am pretty confident performance will be better simply because of my experience in Single Player.
edit: This game also needs more AI enemies in total. It is worrying that CPU usage is so high when there are only like 20 enemies in a village. There needs to be more guys to shoot as it feels pretty easy on Ghost difficulty with one teammate. I hope the game engine can handle around ~3x as much AI. We play Rainbow Six: Siege against nearly 100 terrorists total on Favelas so I hope Ghost Recon can do similar things.
Rainbow Six Siege spawns 40 enemies at once on Favelas Realistic Disarm Bomb with very high CPU usage. More spawn per bomb. Each other map is 20 enemies before a bomb.