Time for a small review! I'm gonna start by saying that I have played every single Mario Party in existence. Guess I'm a masochist like the Angry Video Game Nerd. :P Anyway, I must say that I think the 64 Parties are lightyears better than the GCN Parties, so I'll speak my mind on them seperately.
Mario Party 1
My favorite thing about this game is the soundtrack. It was actually very well made and atmospheric for a low budget spin-off title. Second, the mini-games are classic, the game is actually challenging, and overall it has the most features and boards out of any Mario Party. I even like the whole "losers lose coins" aspect of the team mini-games. I'm almost inclined to say it's my favorite of the whole lot if it weren't for the addition of certain other features I really like down the road.
Mario Party 2
This brought along a huge overhaul to the series and it's just the second one. I like the costumes, I like the items and Koopa Bank. I like the new Duel and Battle mini-games, and I like the Baby Bowser -> regular Bowser feature. Keeps 'em on their toes. What I don't like is the lack of extra features outside some hidden mini-games and the fact that there are less boards than MP1. I also thought this game's presentation was less epic than MP1. Seriously, I thought the atmosphere in MP1 could've passed for a new Mario platformer at the time. MP2 sort of set the series up for the "lame-ass board game" label it would be stuck with over time.
Mario Party 3
My favorite MP, and also one of the most ignored. I wish they ended it after this so we could have a nice trilogy going on. Anyway, this game has it all. A crapton of brand new, actually well-designed mini-games, new characters, new items, new and refined board features, and best of all, DUEL MAPS! Honestly, these are almost better than the regular game boards. Now you need strategy to win, and it's more about roving the board than playing the mini-games. All in all, everything is so perfectly fitted together and refined that it makes me sad to see how sloppy some of the other MPs turned out later on. I also like this game's then-new Story Mode. It had some nice twists and made Luigi the default character, thereby propelling him into the spotlight for once. The game's premise and atmosphere once again returned to that epic, "almost a major Mario game" quality that the first MP had. All in all, this is very much my favorite Mario Party of the entire series. The only thing I can think of that's wrong with it are those god-forsaken Game Guy mini-games. Really, those can ruin everything.
I'll be back to go over the GCN Mario Parties later. This is mainly because they suck so bad compared to the 64 Parties that they need to be judged on their own merit.