Three episodes in and I... don't like it. I find all the characters unlikable, with the young foil being particularly grating. The themes of aging, sexism, and weighing the worth of life in the rear view mirror are all tired. Not to mention that they are signaled hot and heavy in these initial episode. Also, who else is done with comedians making TV shows and movies about being a comedian? We get it.
I'm going to continue watching because I have a hunch it'll probably get better (at least tolerable within the next few episodes) and Jean Smart is a revelation. As an aside: the one-liners are fine-to-middling and certainly don't lend credibility to the idea that these are the jokes that made Smart's character wildly famous. Maybe instead of getting meta about writing good jokes the writers could... write good jokes.