Just because he's popular doesn't mean he's intelligent, informed, or correct. This is the argumentum ad popularum logical fallacy.
Being a radio talk show host just means you can be interesting to listen to; it doesn't mean you know what you're talking about.
That may be true but it's meaningless. Heck, you could say that about Rush or anybody else. However, I would think that being the son of a President gives Michael insight and knowledge, as well as a unique perspective, that is totally unavailable to anyone else. His opinions are informed opinions. Michael Reagan is nationally syndicated, and I would guess that if he didn't know what he was talking about he would lose audience.