Batman: Arkham Knight is still a near complete mess for many PC players. Even after months of being pulled so that Warner Bros. Interactive Entertainment and Rocksteady could fix the initial launch woes, the past week's re-release seems to be as bad, if not worse, than it was before. As such, WBIE has issued a statement saying that those who purchased the game on PC can get a full refund on the game up through the end of the year.
We are very sorry that many our customers continue to be unhappy with the PC version of Batman: Arkham Knight. We worked hard to get the game to live up to the standard you deserve but understand that many of you are still experiencing issues.

Until the end of 2015, we will be offering a full refund on Batman: Arkham Knight PC, regardless of how long you have played the product. You can also return the Season Pass along with the main game (but not separately). For those of you that hold onto the game, we are going to continue to address the issues that we can fix and talk to you about the issues that we cannot fix.

Thank you,

Warner Bros Interactive Entertainment

Valve also notes that you should be able to refund the game regardless of time played. They say that there are currently some issues with the refund policy but they are working to fix it and ask everyone to wait a bit before submitting a refund request.

This is one Reddit user's performance after the latest re-release of the game.