Ricky Gervais embodied that role. Just as he does in his current series (the Extras - on HBO) he is about the best actor I can think of at playing really unpleasant people. Steve Carrell does a good job, but his coloring is satirical. The American Office is entertaining but it has a satirical distance from the material that the British version was unafraid to get close to. That's the difference I see - the British Office's humor was bitter and corrosive, while the American Office pokes fun.
Office Space is still the best work movie/series.