Topic on Talk:Grand Theft Auto IV
The check mark isn't entirely a score or rating, it's mostly regarding whether the feature is natively supported or not. Since GTA IV doesn't require any mods or tweaks for 60+ or 120+ FPS it is technically natively supported even though it may cause some issues during certain missions.
You could add a note since GTA IV does have various known issues with 60+ FPS gameplay. I remember the final mission having an issue during the helicopter sequence where you have to mash spacebar to climb into it. The only way to get around it was to lock your FPS to 30.