I want to start this project soon as I can, because it’s one of my favorite and most important thing in my existence. This is going to be a massive game with alot of features, but one of them is a Story Mode, like those of Halo, and I don’t know if that would be a great idea, it is for me, but I don’t know if other people would accept it. Thanks for reading.
A Massively multiplayer online role-playing game (MMORPG) can include a lore like any game (like World of Warcraft), however these games are more played because of the gameplay rather than a story. My advice its to see if others MMORPG includes a story and take them as reference in the process of development (with this i don’t mean of copying them).
IMO story is what makes a game a game, if your game doesn’t have one, well…
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Don’t worry, I already have made a story (For about 200 hours of gameplay lol), but what stories do you know to take references? I will find my own, but I want to know if you know some games with stories. 
You can include stories in MMORPG’s, there are games like World of warcraft and there is also star wars knights of the old republic. Those games are also MMO so it is completely fine.