When it came out, the first Luigi's Mansion was one of the most unique games I had ever played. Even now, it's hard to replicate its style without completely ripping it off, and that's why no one has tried yet.
New set of moves gives the game more variety; Beautiful environments with plenty of secrets; ScreamScraper is a fun way to spend time
...when it's not brutally unfair; Collectibles only seem to be for collection's sake