I think it really depends on a character. It's super hard to stay good if some evil guy makes you his vampire slave - which happens to almost every D&D vampire, maybe except for Strahd (who btw was rather evil as mortal too, at least shortly before he became a vampire lord) - but it's not impossible. I think rules reflect character's nature, not force such person to become someone else after the transformation.
Last edited by Phea; 23/11/20 07:21 PM.