The Mario series in general was never really known for story. It was always about the gameplay. You just need to know what your goal is and do it. That's generally what Mario is about.
I see. Well, that's what I've always believed in. Hopefully, Nintendo will balance out the characters more. Although I doubt much will change. Oh well.
I think the Mario Party series should have just stuck with the original 6 characters: Mario, Luigi, Peach, Yoshi, Donkey Kong, and Wario. I think one of the reasons why it fell down hill is because they're adding way too many unnecessary characters now. Daisy and Waluigi were good additions...