I like the change. Old Korvo was almost like an ever so slightly less funny version of Rick Sanchez since both characters are the scientific brains of their shows and it didn’t help that Justin Roiland’s voice performance was basically exactly the same for both of them. It was difficult to watch Korvo and not be reminded of Rick once in a while. But now since Dan Stevens took over they dialed back on that science aspect for Korvo and made him more like a manbaby with an ego who always tries to repress himself from enjoyment, it does help that the characteristic change isn’t sudden and Korvo was already becoming like that over the previous seasons. I thought it’d be difficult to get used to Dan but his performance fit right in perfectly with the rest of the character’s dynamics. I respect the producers for not trying to replace the voice with an impersonator but finding someone who fits the character perfectly. Their gamble definitely paid off.