3 open world games I found that is so underrated on PC you didn't realize:
The Saboteur - It's a GTA-like game that is set on 1940's where you eliminate nazis for the revenge of the protagonist and the resistance of French.
No More Heroes - An open-world RPG that takes on a hot summer of Santa Destroy (no kidding, that's the name of the city) whereas Travis, the main character of the game takes the journey to be number one in UAA (United Assassins Association). He uses lightsaber btw.
Sleeping Dogs - The story starts where the protagonist is an undercover cop that joined in the Triads to take down others in the underworld of Hong Kong.
You can find these at Steam or GOG