It's subject to opinion, I listed the games I thought were overrated.
FIFA games are very overrated because it's essentially the same game each year with the usual cookie cutter players if that respective year but I have nothing against the game personally.
Out of all the GTA games, the fifth instalment is arguably the most overrated in the franchise but in the same vein as The Witcher 3, as the accolades back up just how good the game is but at the same time very overrated. I think The Witcher 3 is fairly rated but others act as if it changed ARPG's forever, which I don't think is true at all.
In my opinion, the best GTA game is San Andreas, 5 was absolutely everywhere and seen as the greatest game ever made but wasn't as good as the accolades made it out to be. Don't get me wrong, I enjoyed GTA V a lot but not as much as San Andreas and to this day, V is still pretty overrated.
That's just my opinion, though. Both games have awards to back up how good they truly are but usually it's more than just that...