It appears that Batman: Arkham Knight is still broken after it has been gone for four months as it still has plenty of stuttering, freezing, crashing and other bugs.
While it earlier promised that the game will work well, even publisher Warner Bros has acknowledged that it did not fix initial problems with the game.
Warner Bros published a blog post warning gamers about possible Windows 7 GPU issues as well as new requirement of 12GB of RAM in case you are running on Windows 10. The SLI and Crossfire is still not supported as Warner Bros is still working with Nvidia and AMD to fix that as well.
This raises the question if Warner Bros and Rocksteady Studios actually worked on fixing the game or just developing new DLCs, as it is plagued by the same issues that originally made the game unplayable.
In any case, it appears that you can either finish the game as it is, with all the problems, or simply write it off.
Source:
IGN.com.