If it's done right, it can be tremendously funny. I still enjoy watching the Dean Martin Celebrity Roasts.Not a series, but the Netflix Tom Brady Roast.
Seems truly awful. I am not a big fan of the genre in general, although true masters like Norm MacDonald could pull it off. But Kevin Hart seems unfunny to me nearly always, and this show seems more mean than anything.
There's a difference between good natured ribbing, and mean spirited mocking.