According to a Kotaku report QA testers tried telling Warner Bros. about “thousands” of bugs they ran into with the games PC port. Saying they reported things like frame rate drops, texture popping, and plenty more that left the game almost unplayable. The Batmobile was one of the biggest problems of all according to one tester, who said it caused a huge strain on PC performance.
A bigger surprise though is that the PC version wasn’t the biggest issued during development–the console versions were. The Kotaku report says that it was Arkham Knight’s console ports that caused the games delays:
It looks like after fighting through the console problems Warner Bros. didn’t want to delay the game again. If they had pushed it back any further the game could have gotten lost in the fall game release madness. Putting out a game with little competition that’s playable at all is better than one that works flawlessly that gets lost in the pack in Warner Bros. eyes.
If your a business like Warner Bros. releasing a product on time and fixing it afterwards makes sense. All gamers can do now is hope that Rocksteady will be able to push those fixes out quickly and that they’ll get something in return for all of their trouble.
Source: Kotaku