I discovered a bug that has negative DPS implications for the warrior. Whenever you queue Heroic Strike or Cleave, you cannot spell queue another ability.
This has a negative outcome on our DPS due to latency and how abilities, especially instant ones, interact with latency. You can easily test this: Queue Heroic Strike/cleave and try to cast two instant cast ability during the spell queue window (hamstring > hamstring). If you try to do so it will fail to cast the second instant resulting in a DPS loss. I tried this with every GCD and was getting the same results.
This was never in the game. I noticed this because my playstyle does not constitute mashing keys. I always press my buttons during the spell queue window.