Not all of Corbyn's polices are mad, no, but the implementation is the key - and I don't trust him. Let's take corporation tax which I agree in the grand scheme of things perhaps the tories didn't need to cut - why is he putting that back up to 26p at precisely the point where Brexit will kick in?
So much of these policies depends on skilful, slow, tested and sensible implementation and I don't see that Corbyn's team has this.