10/10 to me isn't "perfection", because I don't believe that's really possible in this medium. There's simply too many moving parts for there to be 0 objective issues.
To me, a 10/10 game is one whose narrative, mechanics and design all combine to create something that should be experienced by everyone (regardless of genre preference) with issues that are so miniscule that they don't detract from the experience at all. Obviously that's still totally subjective, since what is miniscule to me might be a massive problem to others, and what I think is an amazing experience might be trash to others.
To me, a 10/10 game is one whose narrative, mechanics and design all combine to create something that should be experienced by everyone (regardless of genre preference) with issues that are so miniscule that they don't detract from the experience at all. Obviously that's still totally subjective, since what is miniscule to me might be a massive problem to others, and what I think is an amazing experience might be trash to others.