Ghost of Tsushima does not seem like it's in danger of being user score review bombed, and this system was not invented just for its release. This actually was first spotted around two weeks ago, but I (and most people) probably didn't really notice until there was another major release like Ghost that arrived. Again, this will not stop review bombing. After the 36 hours is up, anyone can still write any kind of review they want and there's no way to track how much of a game they've played, if any. But at the very least, we won't have people reviewing 30-hour story games two hours after they came out, so that's something.
After 'The Last Of Us Part 2' Insanity, Metacritic Has Changed User Score Submissions
They should honestly get rid of them entirely, but, this is better than nothing, I guess.
I hadn't seen this yet, so, sorry if old.