Halo recreated in Minecraft. Can you believe it took this long?
"We're currently running this on a simple hMod server, using Kits for ammo and a weapon as you spawn," writes YouTube user SidolaTehNerd. "The server also uses a plugin that allows us to link several teleports to one point which acts like the 'Spawn' button and sends you to a randomized spawn-location."
Admittedly, this doesn't look very fun. But, the promise is certainly there. The Minecraft community tends to inspire itself; maybe someone will see this and rise up to the challenge of taking the concept further.