Old School meets New School. This is a game that allows you to dust off those old school modules you have laying around and run them with a "narrative informs mechanics" style of new school gaming. The book contains a lot of info crammed into the page count. Classic Races and Classes, the Effects Engine, a strong gear list, fun character advances, Scaled gameplay that let's PC's work on a large scale (controlling armies, ships, wizard towers, etc.).
The game system plugs a lot of classic numbers (attributes, HP, weapon damage, etc.) into a modern system which includes Fate style mechanics. Knock down the Orc leader you are fighting and then use your knowledge of his past to humiliate him in front of his clan, attack a demon's tower with fireballs from the deck of your new sailing ship, gain experience for betraying the local townsfolk to the dragon. Play all your classic adventures with new possibilities.
So far I haven't found anything I don't like in the book. It's easy to add new classes, sub-classes, and races. You can plug in old spell lists and monsters. Converting old modules is a breeze. Best of all, I get to play the old settings I have laying around with simple yet more modern mechanics.
Take your father's ancestral sword into the local haunted crypt, and give M&M a try.