It's interesting how there are so many Mario Kart imitators, yet there are far fewer Mario Party imitators. There were some contenders throughout the years like Sonic Shuffle (made by the same folks that handled Mario Party), Pac-Man Party and Disney Party (and to a lesser extent Crash Bash). The sheer number of Mario Kart imitator lead to more Kart racing games with quality, as we've seen with Crash and Sonic Racing (not to be confused with Sonic R).
Because of the lack of long-running Mario Party imitators, Mario Party is still the undisputed king of party games that marry board game and a mini-game collection.
(Yet we still haven't got a interactive element like a stage or item from Mario Party in Smash Bros)