Elder sign is a great, relatively light cooperative dice game. It's not particularly difficult to learn (especially if you watch ffg's video), but does feel like it takes a little longer than the complexity of the game warrants, though not by much.
If you hate excessive randomness, then this is definitely not the game for you (it is a dice game after all). But if you enjoy dice games or are a general Lovecraft fan, this game is highly recommended.