Second on our list is the horrible tale of the Warlords of Draenor launch. This is one of the worst launches to ever happen, mainly because of the bottlenecking of a few select quests at the beginning of the leveling experience.
These two particular quests require you to talk to a non-player character known as Thrall and to click a telescope in order to activate your garrison, which was a major point for advancing your experience in the game as a whole.
The issues arose with the massive amount of players trying to initiate the quest, causing the servers to lag and not register your interactions. But it also was plagued by troll players standing on enormous mounts to cover Thrall and other various non-player characters, making it impossible to finish or start your quests.
From this, Blizzard enacted two major changes, one done immediately and then one enacted at the beginning of the next expansion's launch. Blizzard outlined non-player characters through players, allowing other players to interact with them even if they are out of view. Another was the staggering of players entering new content, allowing for several starting zones for players, starting with the expansion of Legion, which was very successful and highly praised for its launch.