Pretty sure login servers getting hammered. First couple hours of every great online game is the same way.
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I don’t know if you consider Blizzard games “great” but their servers are friend e v e r y single time since I can remember xD
There is no doubt that Blizzards closed all the gaps in the MMORPG space since they’ve been doing it forever. But their recent release has bugs that extend beyond the login servers. 
Happy hunting!