I define good as someone who is UFC caliber, isn't a top talent, but has a lot of potential given improvement.
As far as Douglas Lima goes, he's never fought in the UFC so there really is no telling what kind of talent he would be. He lost to Matt Brown back in 2007 if that means anything...
GSP also lost to Matt Serra in 2007 and we all know how a rematch would go, Lima is pretty solid, I don't quite know if he'd be a contender in the wrestler heavy UFC Welterweight division though.
Hardy is a clear UFC caliber fighter but in retrospect his win streak to get the title shot wasn't all that great he didn't go through Fitch, Alves, or Koscheck who at the time were the top guys after GSP but that's what happens when a guy cleans out the division.