Poor Dramatic dialogue. Goodkind was bad about this. Anytime a character speaks, or people interact and it feels off because you know that no one would actually talk like that. It's like the author said "well, this dialogue is less important, so I'm just going to use my first draft on it."
Or plot/character inconsistencies. Also something Goodkind is bad with. These are when a plot point is introduced or a character is described in a certain way, and then later (usually happens in a series) it is inconvenient for the story so, rather than move things around or something, the author simply ignores it and pretends it never happened.
Moralizing. Damn, it seems I just keep picking things that Goodkind sucks at. This is when the author decides they can't get their point across through plot, settings, etc. and bold facedly tell you what it is. Often this can be found as long winded monologues by the author insertion character. Or if you're Goodkind, you fill your story with so much over the top characterization, plot etc, that only a moron wouldn't realize that your message is "Religion is Bad," and then fill the books with excessive moralizing anyway. "And so he did. And then he ate his own shoe."
Now, I liked Wizard's First Rule and Faith of the Fallen. They're really, really good. And the character of Nicci is one of my favorites. But aside from that Goodkind is just a bad novelist. His plots are full of holes. His characters are one-dimensional cut-outs that he randomly changes whenever he wants. And he can't go a single book without a multi-page monologue on moralizing. And he got increasingly obsessed with sex in books 2-5.