Definitely the Number One Lego game in my opinion. Its one of the only Lego games that has an original story, and isn't a Lego version of a different series. (Lego Star Wars, Marvel Dc etc.) Great writing, and comedy, and plenty of references to well known TV shows and movies, such as characters resembling Starski and Hutch, Sherlock Holmes, and scenes referencing quotes from "The Shawshank Redemption", The Matrix, and more. Great game to play solo, or with a friend/family member if you're playing newer version. One of the ways I've heard of describing this game, would be GTA V for kids.
Basically, If you're in the mood for a Lego game with a unique story, this one is for you.