Terrible as in...terrible. Very few of them have had positive scores, and while that's not usually a good indicator of play, it kind of is for Leblanc. The worst case was when I went around to gank a Level 3 Veigar my Leblanc was facing. She had over half her health left. Before I'm even close (and she definitely saw me coming), she initiates and dies to him.
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Black Turtle did a pretty good job.