Yeah look I understand the UK is a bleak and miserable place filled with bleak and miserable people, mate. But to those who have dwelt in lands with sunshine and hope the original Office is a shock to the senses.
As someone who physically lives in neither, and in the "Sunshine state" of Australia. The original office wasn't a shock to my senses. Australia is definitely closer to British humour than americano humour.
I think it'd be fair to say that the US has now somewhat embraced the less happy cheerful variety of sitcom; a lot of modern US stuff falls into that category. It definitely hadn't in 2005 when the US Office came out, though.