It’s called prosopagnosia. I have it and can’t picture faces at all even if I’ve seen them before many times (like myself or my mother or father or twin sister).
It’s actually one of the reasons I like books more than movies. You don’t have to recognize anyone (which I’ve always struggled to in movies especially if characters have the same height, gender, and hair color). Just let go of the urge to and follow the characters using their names.
I’m not sure I’d call it the worst, but Eragon was pretty disappointing. Part of it was that the dragon didn’t look realistic (along with basically everything else).
But the bigger problem was that none of the characters felt real. Brom was disappointing. So was Roran. And Arya. And every other character. The mental communication also just felt wrong in the movie.