This series is relatively unknown (at least outside the UK) at the moment and therefore easy to miss by the big audience but after I watched the whole first season I can say: they have left me thirsty for more!
Hands down very funny! Very awkward but very funny. It needs to feel uncomfortable, that's the whole point. Some childish elements are there but it gives the series it's own strength. Stath wouldn't be a miserable let agent failing to do his job properly if he wouldn't be so childish would he? What would be the point following someone like that then?
The performance of his sister or Al are incredible. I almost can not believe they are not like this in real life. That it's all acted. The empty look on his sisters face sometimes. Priceless!
On this show they know when to stop filling the scene with words and lines and just instead use a lot of awkward silent moments/looks. Pretty good.