Because the first games actually had creativity and a fun and enjoyable system of gameplay that the others had means that my post shouldn't be taken seriously? Really? Honestly, you tell me that MP7 and MP8 are way better than the N64 installments? Those had terrible minigames, side-missions, boards, etc. while the first three brought us something enjoyable to the table everytime.
http://And then you embrace Mario Party Advance?
I mean, I liked Mario Party Advance for what it was but it doesn't even deserve the Mario Party title IMO as it wasn't very enjoyable after a few playthroughs. It was also way too single-player oriented (which sucks bad if you ask me) and the little side-missions you had to go through like every other turn were not fun at all and began to feel like a chore after a while.
So because it was more of a single-player direction you didn't find it enjoyable? I ADORED it, mainly because you don't have stupid people just running on luck throughout the entire game and this had a more balanced scoring system. I'll admit the side-missions were kind of dumb, but the overall system is some of the best party gameplay I have ever played.