I did read it (a long time ago) and I don't agree with him.

I just don't believe the labour theory of value is a useful concept.

I don't think Marx provides any understanding of how the economy works - other than to hint strongly that prices are really a function of power - i.e. when one group has a monopoly on some critical thing, i.e. land or capital, then they can use that to leverage over another group, and then you have basically class struggle.

I mean, it's useful rhetoric, I'm not sure if it's useful theory.