It was a success in making Facebook to improve their service.
Facebook still hasn't improved my trust in them, though.
Facebook improving their "Lists" feature to act like Google+'s Circles doesn't make me any more inclined to use Lists. The fact is, Facebook lost my trust a long time ago and will never get it back. They have a long, long history of opening up your private information without your consent and then (sometimes) allowing you to opt back in to the more closed model.
Lists are something I do not ever want to be public, but I have no assurance or trust whatsoever that Facebook won't one day decide to make everyone's lists viewable to everyone else. As much as I don't trust Google, I at least trust that they won't screw that up.