Regardless of how good you think Watch Dogs looked when it finally came out when compared to its initial unveiling at E3 2012, if you own the game on PC, don’t mind tinkering, and have the hardware that can handle it, you can make the game look better thanks to some resourceful modders.
For example, if you've seen this video, which compares Watch Dogs to the PC version of Grand Theft Auto IV (released in 2008) you've probably noticed that one thing Watch Dogs lacks is dynamic lighting from cars’ headlights.
Guru3D forum member TheWorse is working on a mod that adds that visual effect to Watch Dogs, along with a lot of other features. The mod, which you can find on Guru3D, also aims to add an improved bloom effect, higher density of civilians, and more.