I've played them all so here I go?
Rayman Raving Rabbids consists mainly of a story mode where you control Rayman through a series of mini-games. Once you complete these minigames you can replay them in score mode to unlock bonuses, and also play some of them in multiplayer
Mario party consists of playing a board game where you roll a 10 sided dice and move your chosen character across a board. You are with 3 other people, either CPU or friends. After each person rolls and events occur on the board, you get thrown into a random minigame where the winner either steals coins from others or gets coins.
Wario is just a huge array of awesome minigames of awesomeness, and really funny. No real story and was MADE for multiplayer madness as it does get boring after a while by yourself.