
What I remember most about HL2 was the use of physics. Something we completely take for granted now but iirc HL2 introduced it and showcased it with the puzzles, gravity gun etc. I enjoyed HL2, and have replayed it once or twice, but it was a long time ago and I am not sure I am interested any more.
Thinking on it I suppose I am open-minded about a Valve VR game, they used to be a company that took real creative steps and if they can recapture that, they could maybe create that killer title that brings VR into the mainstream of gaming.
I wait to be convinced though. It has felt a long time since Valve were that company.