Post about the games that are the best of best! If you earn a Legendary medal in a game, post about that game here!
EDIT: 343 Doesn't have the medals ranked as Bungie did in on bungie.net. So I will post medals that I think qualify here. Some are automatic as they were called "Legendary Medals" by Bungie at that time.
Perfection
Extermination
Inconceivable (Highest Spree Medal?)
Killpocalypse (Highest Multikill Medal?)
Gravemind (Kill ALL humans as a Flood)
Flood Exterminator (Kill 10 Flood in a Row Without Dying)
If you'd like to suggest an addition to this list send me a PM.