this is a beta, I'd expect an improvement in the final game
the game looked shit on base PS4
The base XBO version looks grim - reminds me of some of the 360/PS3 downports from early this gen which took a "turn things off and pare down the resolution until it just about runs" approach.
The team seemed to think it was likely there might be some tweaks to improve performance based on IW's past betas.
the game looked shit on base PS4