I am so disappointed with it.
First of all, I hate how the mansions are split up into missions. Honestly, it breaks up the gameplay so much. I understand it's a handheld title, but why couldn't they have a mission mode, and then a mode where you just explore the mansions without the interruptions? Plus, there is a lot of hand holding, it just kinda ruins the game for me.
The ghosts I've also found lack personality. In the first one, the ghosts (specifically the boss ghosts) were so creative, now it just seems like the same ghosts with swapped color pallets.
I do like the varied mansions, and the new abilities your Poltergeist 5000 and flashlight have. Ghost catching is still fun, and the music and visuals are great. However, this feels like such a step down from the first title. I sincerly hope that they make a Luigi's Mansion 3 on Wii U without this mission structure.