I've enjoyed Werewolf and many other variations, and Criminals is my favorite. It's fascinating, the decisions that players make thorough the game. Even when down to two players, there are still interesting decisions.
Psychological Party Games are not my preferred genre, but of that genre this is my preferred game. Offering a bit more tangible evidence to work off then other in the genre I have experienced, Criminals is an excellent game for anyone that loves the genre or a good fit for when you have players that are a bit squeamish about a game like Werewolf.