The holiday season has been the highest-revenue quarter for Apple for a long time now. That's a double-edged sword — it means lots of money for Apple (which they are clearly into, hence running holiday ads and all), but it also means some infrastructure peaks.
People are receiving their holiday gifts, and they do not work out of the box. At all. That's basically contrary to the stereotypical "it just works" Apple promise. If you're confused that a thread about this has some people "complaining", I don't know what to tell you. Try giving your significant other a gift and seeing how they react when it becomes a frustrating and futile evening of ad-hoc tech support. Odds are you'll prefer going with the socks+perfume route again next year.
To be clear, iCloud is only tangentially related to this.
ok cool