Had this been a 'Britcom-proper' it probably wouldn't have been as funny as it is now.
The tragic elements woven into it make it so much greater. Admittedly, there are a lot (and I mean A LOT) of cringeworthy moments in The Office. Moments that make you put your hand over your eyes and look through your fingers, moments that make you gasp and look away, and moments that will make you go "Aaaargh! Noooo!".
Everybody (who is not David or Gareth) who has ever worked in an office setting (especially those who worked in several ..) will feel that The Office is a condensed and compressed series of events, but very true to life. Everybody knows David and Gareth, everybody wants to slap them and shut them up forever. Everybody feels for (and feels like) Tim and Dawn. And everybody knows that an office would be a downright suicidal place were it not for common foes like 'the boss' and 'the wannabe boss' to loathe.
Don't watch The Office if all you want is a quick laugh .. you would feel way too uncomfortable for that. The Office is a true slice of (office) life, a bit larger, a bit darker, a bit more painful, but ultimately more humorous than anything I've ever seen. Make sure you catch the Christmas special(s) as well, as that puts the icing on the cake and makes life slightly more bearable.