Why was Halo 3 so popular? and lived on for decades? While Halo Reach is basically dead.
Custom games.
Halo Reach is basically like Call of duty, you mostly play alone except playing with randoms. Sometimes, you'll form a party with freinds and kick some random's ass but its not the same as custom games where you just play among with your group of friends.
So why was Halo 3 custom games was so successful while Halo reach custom games are a piece of crap?