First impressions: You can tell this game has a lot of detail and work put into it from smooth animation to realistic textures and cutsences Which hypes up the game Which is perfect for people who aren't familiar with the Luigi's Mansion series.
The story: The story is Luigi being invited to stay at a very fancy hotel with his friends (Toads, Mario and Princess Peach), Luigi Wakes up in the middle of the night to find out that his friends has been trapped by king boo! With a little bit of help you venture though the hotel to capture ghosts and save your friends from king boo. Honestly the story is very unique from the other games in the series Which determines you to finish the game
The gameplay/mechanics: If you've played the other Luigi's Mansion games theres a big difference with the controls and how the game is played. The controls are pretty easy to master which makes the game a whole lot easier. The gameplay is phenomenal because of how satisfying the physics are and the difficulty for catching ghosts which makes the game perfect and easy to get used to.
Bossfights: The bossfights is where I think most people playing give up throughout the Luigis Mansion series because it's hit or miss. For one bossfight it's easy and the next one you're on the verge of burning your house down, though they're still pretty fun.