Another reviewer has already made a solid case for Prince Valiant: The Storytelling Game. I write mainly to underscore his comments. In a nutshell, Prince Valiant is a very clever game. When it came out in 1989, it was avante garde without the pretentiousness of calling itself that. The junior brother of the well-regarded and far better known Pendragon RPG, Prince Valiant offers streamlined and easy-to-understand rules, at the core of which lies a universal (or near-universal) mechanic that works really well whether your characters are jousting, causing flesh wounds to the Black Knight, seeking to rouse a crowd of peasants, or attempting to win the fancy of a beautiful, red-haired lady-in-waiting. The game doesn't merely do these things; it does them elegantly and -- particularly in extended resolutions (such as in personal combat) -- with a real sense of drama. It also does them fairly quickly. The game does not bog down into long dice throw-fests or involve an array of numerous (and rule-specific) feats and the like. The mechanic is designed to give you a dramatic answer to a question quickly. This same quickness is inherent in the drafting of your characters. Even playing with all the optional rules, a thoughtful player could put together an interesting character in 15 minutes, and probably less after gaining familiarity with the game system.
So what's not to like? There are a few things, but none really have anything to do with the game itself. First, it's hopelessly out of print, without any real prospect of it ever coming back into print. So secondary sellers on Amazon or eBay are the only way to go. Second, there aren't any supplements for Prince Valiant. You can borrow a lot from the many high-quality supplements made for Pendragon, but you'd have to tailor them. It bears mentioning in this regard, though, that Prince Valiant practically begs to create adventures on the fly. Still, on balance, I suppose a lack of supplements is a negative. Third, you're either going to like this subject matter or not. If you're not a fan of Arthurian legend, the game may fall flat for you. Finally, virtually no one seems to know about this game, so there is not a ready group of fans to round up to play. But, really, that's hardly an impediment. Whip up a good, fun adventure concept and spend a night romping through it. They'll be back for more.
Conclusion? Five stars. Well worth buying, particularly if you're looking for a quick, clean system with which to explore the world of King Arthur ... and probably readily adaptable to other, similarly heroic milieu.