This is quite possibly the most amusing show I have ever seen. I would echo the comments on here about it being under appreciated. It truly is up there with The Office, Fawlty Towers, Blackadder and all of these. Indeed in my view it is better.
If you haven't seen this watch it. Now. It has become somewhat of a cult between my friends and I, verging on obsession.
So, how does it work? It's hard to say. At first the POV thing comes somewhat as a gimmick but actually you really don't notice it. This programme would be brilliant without it. However the way thoughts can be heard, the person POV followed etc really adds to the programme.
The characters are brilliant and all entirely believable whilst being completely ordinary. They are not special in any way. Their situations are on the whole ordinary too... This is just pure comedy based on situations, characters, dialogue and plots. Every aspect is perfect.
There's a bit of Mark and Jeremy in all of us, that's why it works.