First off, I really hate Gamespot's new scoring system. It seems like way too many games get a perfect score now.
My pick is Metal Gear Solid 5. I have never been more disappointed for a game in my life. Considering I'm a huge MGS fan, I was hoping something similar to what was done before. Instead it was a bland, repetitive game that I have no Fu%($$ clue how it got a 10. 7/10 at most.
Honorable mention, Super Mario Odyssey.