A game with a perfect score doesn't mean it's without flaws or issues. If it got a perfect score it means the overall quality of the experience that you had with the game was just that damn good, easily eclipsing the minor things. Sometimes the things you love and consider perfect experiences aren't perfect in all things. There's always something you maybe wished it did different or better. That's how it is. Final Fantasy VII back in the PS1 days wasn't what I would label perfect, but it was an unbelievable experience for me, enough for me to look past any issue I had at the time. Lost Odyssey wasn't perfect, but that would have gotten a perfect score from me also, Blue Dragon would have been another perfect score for me. Quantum Break would have been a perfect score from me. South Park: The Stick of Truth would have also gotten a perfect score. Halo 4 would have also. Splinter Cell Conviction? Another perfect score from me. Loved that fucking game.
Every game that has gotten a perfect score anywhere has issues and flaws. None of them are truly ever 100% flawless if we're being totally honest, although there are games I feel that do achieve that. Did people love the weapon degrade system in Breath of the Wild? I sure as hell didn't, and yet it would get a perfect score from me. It just wasn't enough of a problem to degrade the game from a perfect score. Lots of people gave the last metal gear perfect scores. Was that perfect? I sure as hell think not.
A perfect score even when someone acknowledges issues is a sign that the game's strengths are just that fucking strong in the eyes of the reviewer. God of War 2018 isn't perfect, neither was Spider-man, Ghosts of Tsushima, but they all got perfect scores from someone. The best game out of those 3 by far is God of War. It's easily better than Ghosts of Tsushima and Spider-Man PS4. I think the one game among Sony's recent games that's actually on God of War 2018's level is The Last of Us 2, but some would disagree with that. Last of Us 2 and God of War 2018 would get perfect scores from me, the rest, including Horizon Zero Dawn, would not.