Opposing teams full of Sunbreakers. Lag. I've even seen people with green connections teleporting (I had green connection as well). Putting three rounds from Invective into someone who then one-shots me with Conspiracy Theory. They've got the same range stat. Putting 3-4 bursts from Apple of Discord into someone's face who then one shots me with Conspiracy Theory. The fact my grenades do little damage yet I'm regularly OHK by the same grenade type. Edit: Forgot to include the obvious one - being shot through walls.