Post gamemodes, games, community features, etc that most people see as cringe or sweaty and either don't know about or dislike that you love.
I'll start
I love halo reach clan raids when done properly. Even when taking away elements of larping as a loyalist covenant thing or whatever, raids by themselves done right are the most fun thing I can find to do in a first person shooter game.
How do raids work?
One clan asks another clan to raid and they negotiate for what the raid rules will be and for what map they will play on and then they go either until one team gives up, one team is in control of the base when the time limit expires, or until one team breaks the raid rules. In a raid there will be a base the defending team controls and it will have an armory of power weapons in it. The defender's advantage is that they have the cover and the power weapons.
The offender's advantage is that everyone spawns in the same area so if they kill one person on the defense, the defense can be permanently crippled. The offenders also get the advantage that they can concentrate their forces in one space and can be more mobile than the offenders.
The offenders try to use a mix of skill, creativity, and coordination to get a guy or two in the base, keep as many defenders at spawn as possible, and when they're ready cause as much chaos in the base as possible to get control for it contested so that they can take over eventually. Raids usually last multiple hours.
The rules that my clan usually used were
>No using base weapons or vehicles to spawn kill, however using things from spawn to spawn trap is allowed
>No using spawn vehicles or weapons in the base defense since it deprives the offenders of their tools
>No secret vehicles weapons mods or teleporters on the map
>No long bridge maps
>Defenders can have one rocket launcher one spartan lazer and two snipers up at the same time or they have to get rid of either the rocket or lazer to bring out a scorpion
>No defenders can have a member using two power weapons at once (We don't consider shotguns or swords power weapons)
>If it was us defending, we'd let each team only have one banshee up at once and only if the bases is contested
>Offenders get at least 4 fast ground vehicles
Our clan usually had a few more restrictions that we'd put on ourselves that we didn't put on the raid rules I.E. We would use 3 concussion rifles instead of the max of 5, rather than no double power weaponing, we'd have our members never use two weapons that require two hands to use