Everything. Mario Party 8 can die in a hole. Specifically,
- Bring back regular items like MP3. The effects of candies were terrible and concept was cheesy. Orbs are okay but made me sad because initially you can't buy them. MP4 had bland items.
- Better designed boards (seems to be done already).
- No excess of luck games. This is key, lately the recent games have too many. I love luck games but CPUs cheat at them a lot, the rewards for losing usually are nothing or a negative effect and there's just too many.
- Better minigames overall. MP8 had boring minigames that had near nonexistent replay value.
MP9 so far seems to be completely different from MP8 and seems to learn towards the classical N64 games, which I'm happy about.