If you're effectively porting a console game optimised solely for AMD's GCN architecture (as far as it can be on DX11 XB1, and to quite some extent on PS4), and then enter into a contract with NVIDIA to infest the game with their malware (GameWorks), it's likely to have a predictable effect. It's a horribly optimised mess. Doesn't matter if CDP intended the PC version to be like the original footage, that was likely before the integration of NVIDIA's closed libraries, which would ruin performance for both vendors. Thus you get a massive graphics downgrade combined with laughable performance.