I disagree that there are no 'hardcore' Pac-Man fans around. All of the games still sell, it is just that most people who really like Pac-Man are not really all that into games and just have it on their cell or something. Pac-Man Party is a good way to get the fans that grew up with the game to get something both them and their kids would like.
To be honest, I think this looks like one of the better Mario Party-like games around. I also like how they changed the designs of the ghosts to differentiate them, even if their results were mixed.