yeah i agree. i think kojima did the same thing with mgs 2 as initially the prologue with snake in that game was separate from the main game. plus ground zeroes is meant to be replayed to show how a mission can be different. i think the main mission is like an hour long with the 4 side ops at least around 10 mins each. theres an extra mission “deja vu” which you need to collect the XOF patches for.

Metal Gear Solid 5: Ground Zeros was not a demo it was a seperate game from Metal Gear Solid 5: Phantom Pain. It was also the conclusion of the Peace Walker storyline. Not only that but depending of what console generation you bought Ground Zeros on it was only 20 to 30 dollars compared to the average 60 bucks you would spend on a game. Sure you can beat the game fast compared to other Metal Gear games, but they included bonus content. Ground Zeros was not a rip-off, it was made to end the Peace Walker storyline and to give a feel for open world Metal Gear. Get over it.