Didn't realise this was a biopic. I thought it was supposed to be a comedy spoof. But thanks to google I've learned a bit about the character and the man behind the act. Might have to re-evaluate my earlier opinion of the trailer.
Yea, Dolemite is considered one of the quintessential "Blaxploitation" films of the 70s. Apparently Snoop Dogg lists it as an inspiration and he's in the film as well.