The greatest potential wasted

Redditors started to share games that didn’t live up to expactations, games with the greatest potential that wasn't properly capitalized on (https://www.reddit.com/r/Games/comments/7con81/which_game_had_the_greatest_potential_that_wasnt/). So we've collected some of the titles, too. They all could be the best games ever with unique features, but for some reasons that's not happened. Well, at least we can dream about what we could have.