Do less attractive actors receive more credibility

The answer is yes and no, but that usually has to do with a lot of casting directors' assumptions. Really glamorous and stunningly beautiful actresses often miss out on roles because they're considered too pretty. Jessica Biel has said she's frequently denied auditions because of her beauty, and Halle Berry had to fight like hell to get cast in Monster's Ball - reminding the director that a woman's problems didn't vanish if she was pretty. It's similar with a lot of guys who get dismissed as pretty boys with no talent. It took Leonardo DiCaprio years to shake off his heat as the heartthrob from Titanic. Actors and actresses who are good looking tend to get pigeonholed in roles that only showcase their beauty. And they can often be written off as airheads whose only function is to be decorative. This is a double-edged sword because ultimately the only parts they end up getting are shallow ones in forgettable projects.

Actresses who are pretty but in a less obvious way tend to fare better. As in they can get in on roles that have substance. Basically the rationale is that the less attractive an actor is, the more 'relatable' they are. Look at how often actresses undergo major transformations to win respect from critics. What usually helps is a vanilla sort of beauty - being pleasant to look at but not in an obvious way. Too good looking or too ugly and they get pigeonholed in character roles.

She is extremely hot, to a real man. She has a brain and a personality.