Warner Bros have announced that they have stopped selling the PC version of the Batman Arkam Knight due to performance issues.
The company announced that they are halting sales of the game whilst they fix the issues and are also offering anyone who wants a refund on the game.
We want to apologize to those of you who are experiencing performance issues with Batman: Arkham Knight on PC. We take these issues very seriously and have therefore decided to suspend future game sales of the PC version while we work to address these issues to satisfy our quality standards. We greatly value our customers and know that while there are a significant amount of players who are enjoying the game on PC, we want to do whatever we can to make the experience better for PC players overall.
Thank you to those players who have already given valuable feedback. We are continuously monitoring all threads posted in the Official Batman: Arkham Knight Community and Steam forums, as well as any issues logged with our Customer Support (support.wbgames.com). If you purchased your copy of the game and are not satisfied with your experience, then we ask for your patience while these issues are resolved. If desired, you can request a refund at help.steampowered.com (Steam refund policies can be found here: http://store.steampowered.com/steam_refunds) or the retail location where you purchased the game.
You can find out more information about the game and what the company is doing to resolve the performance issues at the link below.
Source WBGames