Finally got around to playing this, was not disappointed. Luigi is back with another entry in his unique franchise of kid friendly scares and humor.
The game is arguably the most gorgeous game on the switch and somehow ran smooth the entire time until before the final boss fight. The music is good, the gameplay is fun, and the atmosphere is incredible what more could you want.
Actually I can answer that, because the game suffers with its characters, level design, and controls. Compared to the first game the bosses in this game are completely forgettable outside of the cat, director, and hotel manager, the controls are frustrating at times with how the plunger and flashlight features just doesn't hit their target, the level design is really hit or miss with fixed cameras making some sections rage inducing, and for me Luigi's voice sounds extremely off but as I haven't played many Mario games since the GameCube era this could just be his new voice and I'm not aware of it so I won't hold it against them.
I still think this is a really fun game and highly recommend it if you want a fun time, and it has coop making it a fun adventure to play with your family or friends!
I didn't touch the multiplayer portion of this game so I'm not counting that in my score.

Honestly the most fun I've had with a 3D Mario game (though I need to replay galaxy to see my feelings on that) with fluid controls, epic music, fun visuals, and some pretty cool ideas. The fault with this game is being so forgiving and easy that it requires you to take breaks to deal with the sluggish boss fights that are usually the exact fight you did three levels ago, and while I'm all for easy games this is TOO easy, along with the issue of the more open maps checkpoints being a bit too spread out forcing you to run all the way back to where you were if you somehow manage to die to a floor hazard.
However the ability to take control of iconic enemies and use their abilities to traverse a level or solve puzzles is really fun and that's a massive reason I don't hate this game, add in the funny costumes and it's a good time.