Steam reviews are becoming a pathological game for developers and players alike.
At 8000 hours played, this guy should have the privilege of posting a review which is both more visible and less weighted in terms of good/bad. After a certain amount of engagement, you're implicitly thumbs upping a game. However, players with that level of commitment and sunk time feel disempowered when a game changes to betrays their expectations. They should just have a different kind of review that at the same time as it takes away their ability to thumbs down the title, it gives their thoughts visibility to the developers and community.