He's great on the guitar but noticeably loses it when he starts to sing - like the singing is too much of a distraction. My advice; just stick to the guitar and let somebody else sing.
This post reminds me of the Seinfeld episode where Elaine mildly criticizes her colleague (played by Molly Shannon) for not swinging her arms when she walks, provoking Shannon to fly into a violent rage. Hilarious.
Haters.