American comedian Steve Martin is a surprisingly good writer. I haven't read his novella, but I have read several of his pieces in the New Yorker. He's very, very good. It always surprises me because you wouldn't think he's as clever as he is. . .the parts his takes in filmsparticularly the ones 10 and 20 years agoare/were often so silly.
But in general I have a problem with actors etc try to become writers. I mean all they have to do is wave their hand and their book is published because their books will sell regardless of merit. I think Ethan Hawke for example wrote a novel. Yet "real" writers actually devote their lives to writing; it's not a side thing for them. And their work is invariably better. So actors/comedians publishing books just seems a waste of space, a waste of paper, and a waste of a valuable slot on a publisher's list.