I don't recall any from expansion launches but I recall plenty from vanilla.
Those servers were unplayable for weeks. If you got in, you'd crash, the server restarts. Was bad.
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I'm seeing a lot of people here saying they're getting into queues of 4,000+, I'm struggling to even get into a queue.
I get told the world is full, try again later, and then I can't attempt to log in for about a minute.
Then if I do get into a queue, it's only about 500-700, but even then, I get kicked before I can log in.