My big problem is most of the show is interviews which use the same gag over and over. And I get really bored of it. For that style of a dumb character doing a bad interview Ali G is much better.
Her stuff has been on YouTube for quite awhile. Watch the highlight clips there and save yourself lots of time. Plus she's done more than one show. "Cunk on Britain" for example.
I'm only familiar with her on After Life so I enjoyed her shtick and laughed throughout. But as has been mentioned, the interviews became tiresome so 5 episodes was perfect.