Anyone who has enjoyed a game of Scrabble will enjoy this movie. The Scrabble champions depicted in the movie (real people, not actors) play a game unlike any you're likely to find in the family living room. Words you've never heard of are so common in their games that you almost want to have a dictionary by your side while viewing the film. The only thing stranger than the words are the contenders themselves. "Neurotic", "self-centered", and "compulsive" are a few of the words that can be used to describe them. But, you can't help but watch them--kinda like watching a train wreck in some ways.
If you are in the category of "Scrabble enjoyers", you will also like the book "Word Freak" by Stefan Fatsis (the book, in fact, is the genesis for the idea of the film).