The Thick of It is a modern day classic of British TV and is great if you're a fan of either politics or comedy, although if you have a good understanding of British politics, you're bound to understand more of the references.
If you have never seen the show before, treat yourself and watch it from the beginning. It'll definitely help with knowing more about the characters.
Season four may not be the strongest series overall, as the opening episodes start off a little weaker than what is to come, but it soon picks up the pace and the latter episodes are up there with the best of them
Season 4 is quite a bit different to the previous series, largely because the previous ones have focused on the (fictional) Labour government. But, as The Thick of It always stays topical, we're now treated to the same show `coalition style.' This has attracted some criticism from fans, not liking the new set-up. However, I found it the natural progression of the show and the fact that it still works is a reminder of just how flexible the show really is.
The last couple of episodes are a little different to the rest as they're based on the Leverson enquiry - these ones aren't `laugh out loud funny,' but they're an integral part of the story and foreshadows what is to come
I would say the only downside to the season is that it's the last. Once it's ended it still leaves you with a sad feeling knowing that it's all over now and a thirst for more. I'm sure if the writers wanted to continue it they could, but they've decided to call time on it before it got stale.
Enjoy it for being the greatest political comedy since Yes Minister (and certainly the most sweary!).