Ballistic weapons.
Thanks for reminding me - Raycasting guns. Makes sense for melee, but long range weapons shouldn't hit instantly.
People who talk about the loving "Renderman" or "Blockland Adventure Mode" bullstuff.
Guns having limited ammunition. Just annoying resource management for the sake of stupid "realism." Has anyone ever thought to themselves - "Boy, this gun sure is fun, but what would make it great is if it became completely useless in the middle of a fight!"
People who use, propagate, and "fix" crap-ons like they're limited edition collectors items. You got add-ons so broken that the creator of the goddamn game makes an effort to remove them for good, then you get douchebags who want to use them anyway. Thanks for the step backwards, starfishs.
Stop me if you've heard this one, RTB users: "BLOCK BOT IS A BITCH!!!!!!!!!!!!!!!!!!!"
Rules against spawnkilling. Build your loving spawns properly. There's a more general complaint here - rules that wouldn't need to be in place if your server was designed properly.
People bitching about v21, asking how to revert to an older version, or unironically vilifying kompressor because he was the figurehead for it. It's been months. Get over it.