As usual with Valve games, Half Life especially, its a series with its main purpose to push gaming technology forward.
The first with how it changed cinematic storytelling for Fps games.
The second with its source engine and physics.
This one seems to set out the new gold standard for single player triple A VR gaming that will be a thing in the future and Valve are always the pioneers in this.

The Hotel section is fantastic, if you have the set up, play this one.