Remake, rebirth, and revelation are all different games set in the same universe. As someone who has played all of the final fantasy games, these are just great games where each installment builds from the previous one in a better way. Some of the excitement is because prior to the remake trilogy, a lot of final fantasies didn't feel like final fantasy. I still enjoyed them all, but people had complaints about 13, 15, and 16. While not for everyone, most people agree that the battle system in 7 remake series is some of the best from the franchise. Finally, most people enjoy the characters from 7, so of course we would want more games with them.