Gonna give the award to Kojima on that one...
Spoilers
Between MGS2's entire marketing campaign hiding the fact you played as Raiden on a sunny Big Shell Oilrig after featuring pretty much 95% of the Solid Snake gameplay experience in the Demo, hiding the antagonist, the plot and pretty much everything including bosses, settings and themes.
To the stunt he pulled with MGSV where it was supposed to be a game about Big Boss's fall into darkness and creation of Outer Heaven , with trailers showing him working with Skullface, Shooting kids in mines, torturing everyone, burning entire village of people in africa, shooting his own men, strangling Chico in cold blood, then you get the game and it's all about Vocal Cord parasites, he's not working with Skullface at all, he never shoots kids, the only reason he shoots his troops is because they are infected and ... It's not even a game about Big Boss, but a random brainwashed medic in a story that doesn't really fill in the gaps that were supposed to be filled.
Ex:
I still want to play THAT GAME !