It's said that it's too easy to pick on Microsoft's worst OS ever, but we do it anyways, because we can. :)
Submit links to funny pictures mocking 8, news reports about how terrible it is, or just general self-posts bitching about your own experiences.
This isn't a place for tech support about how your new install is blue screening all the time. For one, that's actually the norm, and for two go bug the people at /r/24HourSupport.
Remember, XP and 7 are still here for you. They'll take you back and comfort you after 8 is done abusing you.
Inspired by our friends over at /r/AppleSucks.
Stylesheet shamelessly stolen from /r/Android, I did do some edits to it though.