Zach Mettenberger was very good for them , but he 's gone , and Brandon Harris has n't done much to impress everyone .
LSU 's Achilles heel for many years has been their QB .
Zach Mettenberger was very good for LSU , but he 's gone , and Brandon Harris has n't done much to impress everyone .
LSU 's Achilles heel for many years has been their QB .