I bought the game yesterday and I am enjoying it so far, however I have noticed some terrible screen-tearing all the time.
I have a R9-380X GPU and a C24F390 monitor ,both support freesync however the feature doesn't work.
I have my frame rate capped at 70 FPS through the AMD settings, and after noticing the tearing I capped the frame rate to 60 through the game settings, however that didn't fix anything. I never measured the frame rate at which the game is running at but turning on the V-Sync unsurprisingly did eliminate tearing, so the option that the game was running below the frame rate thresh hold for FreeSync is not on the table.
FreeSync works fine in other games, so I'm not sure what caused the problem.