My brother just bought his album and it is awsome.
His messages are very positive.
I have always loved reggae and ska music (and yes, I am a white guy) and I think Matisyahu is terrific! Not only are his messages uplifting but his music is really good. I play it at work on my PC interspersed with Bob Marley and the Maytals and none of my co-workers (who are largely black guys) have caught on that OMG, this is a white Jewish guy with a beard! I see nothing wrong with his "appropriation" of the reggae style. Rock on!