Oh yeah, for anyone wondering about Super Mario Party Jamboree after how hyped up it was: It's... good. Not great, just good. Which is a damning review given that so many people thought it would possibly be the single best game in series history.
First, the minigames are too freaking long. That may sound like an odd complaint, but trust me, it exacerbates every other issue. You'll frequently run into minigames that are 2-3 minutes long as opposed to the ~30 seconds that you typically expect them to take. There are quite a few in particular that I dread having to play because of how utterly boring they are. Second, there's so much waiting even outside the minigames, with slow animations and generic voice lines by Jane Doe from Nintendo's HR department every single time anything of minor significance happens. New turn? Voice line. End of a turn? Voice line. [Number less than five] turns remaining? Voice line. Someone landed on a Bowser space? Voice line. You're playing a minigame that consists of multiple rounds? Voice line every time a round begins. Someone bought an item? Everyone stop what you're doing, we need to play like three animations in a row with audio jingles to signify that someone just bought an item. Someone is using Boo to steal a flat unchangeable number of coins? Go ahead and check your email, we're gonna be here a while. So much waiting for things that were instantaneous in past games.
Then the jamboree buddy system is terrible, easily worse than what Super did with its partners. Once someone passes by a buddy, everyone has to play a minigame to see who wins them, and the jamboree buddy minigames in particular are some of the longest in the entire series. But a big buildup is justified when the reward is so massive, right? ... Except it only last two turns (technically three, but that counts the turn you get the buddy on, so it's functionally two most of the time). And anyone can steal your buddy by simply walking past you, so fuck you if someone happens to be behind you when you get them. The buddies can be extremely powerful, letting you do things like buy two stars at once and double-dip on good luck spaces, but you have them for such a short amount of time that it usually doesn't even matter. I've had multiple occasions where I won a buddy and couldn't even use them because someone stole them before it got to my turn. And to add insult to injury, the game seems to love introducing a buddy on the second to last turn, so everyone might get roped into playing a long minigame that doesn't have any effect on anything.
There are other lesser problems, but those are the big ones, and they combine together to make the entire game feel like a slow, tedious slog kind of like a certain other hyped-up Mario game that released a few months ago. I couldn't imagine playing anything more than 20 turns, and this is coming from someone who regularly played 50 turns in the classic games. It's not terrible or anything; I'd put it squarely in the middle of a list of all Mario Parties. Better than Super, doesn't even compare to Superstars.