She asked better and fairer questions than Lehrer did, but she let Edwards get away with breaking a LOT of rules, and she didn't keep him reined in on the questions that were posed to him. Comparing her with Lehrer, I'd say she definitely did a better job, but that's kind of like saying that dying of a heart attack is better than dying in a car crash.
Didn't matter in the end - Cheney eviscerated Edwards in spite of the moderator.
She asked a lot of tough questions of both Cheney and Edwards. She nailed Edwards on the French and Germans calling him naive