A comedy of this sort must be hard to get right. The slightly twisted and immoral actions of Prentiss McCabe (the PR firm) and the success of which the actions are executed could be perceived wrongly in many ways; A) smug main characters, B) evil/comical/unreal characters, C) a week over realistic portrayal of life in a PR office.
Absolute Power has got it right (9/10 times anyway...). The achieved balance ensures that all the characters seem very real (enough for the viewer to feel sorry for them) yet they are still able to get away with things that you or I would never dare! The result a wonderful comedy which sings a tune much like that of Black Adder, with the ingenious Charles Prentiss bashing around (less physically then in Black Adder) the ignorant underlings the same way we always loved to see Black Adder boss around Baldrick et al.
If you get the chance to see this comedy now and your in the position to understand it (some minor knowledge of UK politics might be required for viewers to get all the jokes) my advice is to do so soon. I say soon because there's a slight danger that Absolute Power relies too heavily on "in jokes" about UK politics to stand the test of time... But for now Dig In and Enjoy!