Borat
The plot: Borat travels to America on behalf of Kazakhstan to see what lessons can be learned for his country.The good: It's very funny. You will find yourself signing up to the Pamela Anderson mailing list though I wouldn't spoil it by telling you why :p.
The bad: Lowbrow humour, some of the situations are just obviously set up.
Conclusion: If you enjoyed the series then it's unmissable, if you're a fan of things like Jackass, American Pie, silly comedies in general then it's recommended.