If you roleplay or do fanfic or write any story—original or some fanfic of an already existing story—the dialogue sounds awful, and that’s true for every AI: ChatGPT, Claude, Grok, etc. Mainly, the dialogue is unbelievably repetitive, and then characters either have an overreaction to something or an underreaction to something. The dialogue sounds truly, truly awful. No one really has a distinct personality; they all sound the same, repeat the same lines, and the dialogue is cringelord-tier. It doesn’t sound like real, actual people talking.
Because all of the funding is going towards making them more competent at following instructions and not being offensive to corporate sensibilities, and making an AI model good at those things makes it worse at producing creatively interesting text. There are models that are attempts at retraining to be better at that, with limited success. I think there just aren’t a lot of resources being devoted to improving this area.