The color grade in GTA is of course an artistic choice and rendering the entire game with foggy overcast light and a strong green tinge (which btw. is not how German cities look, we aren't living in a bad color transfer of The Matrix) makes it look bad at the macro level. The details might be enhanced by this method, but honestly it's kind of hard to tell from a heavily compressed 720p Youtube video. What looks okay or even better in a video doesn't have to look better interactively, uncompressed, in native resolution.
Hot take: The overall tone of the style produced using this dataset comes from capture artifacts.