Do you even bugtest?
The game is a buggy mess, Heirlooms don’t give certain stats they should give like hit rating and resilience.
I had a boss drop through the floor in a HC UP thus giving no loot.
None of the feasts apply the spellpower to healing, they only apply it to dmg.
Quests sometimes bug and don’t work as intended for a reason or another.
Just a few examples on the bugginess of the game. The whole gehennas queue thing is bad enough for a game I pay for but the insult to injury of the game itself not working properly when I actually do get into the server is just sad.
Deposits of an area popping in the adjacent area, but if you step in the adjacent area then all deposits disappear. (particularly common in Icecrown and tundra) → deposit stuck alone forever
Mining a deposit and turns out it’s empty, still granting the mining point but no loots. (I assume this one is a layering related bug)