They mostly suck. Nobody sucks as much as Johnson though. McAfee seems the most real to me. Petersen is the only prolife LP candidate running for the nomination as far as I know. But he's always been an obnoxious troll, and now he seems like he's pandering for the Rand Paul vote in such a way that doesn't seem sincere to me. But, at least he's taking most of the right positions.
It would be nice if the LP nominated someone not named Johnson.