That depends. If you find a gurning woman aping social stereotypes of black people, and setting back the notions of racial equality about fifty years or so, then yes, she's hilarious!
Personally, I think she looks about as amusing as dysentary on a coach holiday, and that's just from the trailers - I can't seem to find the time to actually watch one of her shows, the food in my fridge needs to be put into alphabetical order.
andy, as is SO often the case, I couldn't have put it any better. The answer is no, she isn't funny. Though the stupid voices and constant mugging might appeal to 5-year-olds.
I saw the trailers too. My first thought was "Why is this black woman taking the pi55 out of other black stereotypes" - that went out with Jim Davidson's Chalky.
I wouldn't watch it and I think she ought to be ashamed of herself.