Completed all Sidemissions and the main story.

8.5/10

Once they polish & fix the remaining bugs the game is easily a 9.5/10.

Personally for me it's a 9.8/10
No other Singleplayer game since the 90s hooked me into such long playsessions without it getting boring but I have to be realistic and take the remaining (slightly immersion breaking) glitches into account when rating.
Despite that, you miss out if you don't play through this game when you have a potent PC.