I won't comment on his painting (haters gotta hate includes me) but I will say that he got everything from this guy.
I taught painting for over 35 years. The fact that Bob Ross made people get out there and paint is a major point in his favor. The fact that he favored tricks over actual observation is a shame. He taught thousands of people to swivel a brush, drag a knife, put a dab her and there and Voila!, you have something that looks like something. My painting may not be any better than his, but in teaching the craft, I think the point is to get people to look more carefully at the world around them, not try to learn tricks that will make their canvases all look alike.