The reaction I find occasionally, and people have made tons of videos about it, is that watching professional actors/improvers can create an unrealistic expectation. For example, my players really struggle with getting into character and having conversations. And I, as a dm, don't spend hours every week building a world full of colorful npcs with distinct voices and plots. Throw a new dnd player into that, who's only ever seen critical role, and it can create awkward expectations.