With all do respect, Mario Party mini games have always been a cut above the rest of the mini game crap out there. If they add in some spiffy graphics and new wii controlled mini-games, count me in.
1 was great, but 2 was a lot better, I'm thinking they put extra effort into that.
I think that for, at least in the case of Mario Parties 2, 4, and 5, it dropped in score based on how redundant the franchise is. But 2/1/4/5 are probably the best in the series (in that order).
5 was a bit too slow for my tastes, so even shorter rounds tended to kinda drag on, that's why I liked both 6 and 7 more - they sped the game up and everybody spends less time waiting for things/events/games to happen.
I'm actually expecting some changes in 8, nothing drastical of course, but definitely more changes than we saw between the iterations that were on the same platform (1-3 / 4-7). They'll set some kind of standard with 8, and the games following on the Wii (9-1X) might basically be expansion packs with new mini-games and slight adjustments. That's how I viewed most of the CG ones after 4 anyway.