Which board games offer the experience Mario Party does though? Plus, video games have the natural advantage of managing all the moving parts for you. Throw in the multiple boards, mini games, and board events, and Mario Party dunks on most board games tbh.
Mario Kart is great too, but is slightly more crowd dependant, and I usually only use that if the group has experience. For non-gamers, even Mario Kart 8 can be a bit demanding. Sitting around in 12th place for the entire race isn't particularly fun, and I don't want to kill the experience for someone.
I think what helps Mario Party, or any of the other party games, is that anyone could jump in with no prior experience and be competitive. You can even apply handicaps in-game. Over the years, I've played these with kids, adults, and seniors, and they all had a blast with Mario Party. Mario Kart got a mixed reception, with inexperienced players often disengaging pretty quick.
Although, yeah. I wouldn't recommend the series for just normal play. Especially, for non-casual gamers.