His value theory - though, I understand, comes by and large from Ricardo
Marx is Ricardian only insofar as he begins with Ricardian economics, and then turns it inside out. Ricardian (like Smithian) value theory presents value as an objective property of the commodity, and the commodity as a naturally-occurring ontological category in all human society, while Marxian value theory presents value as a social property of the commodity, which is itself the alienated expression of a social relation specific to capitalist society; they're basically the total opposite of each other.
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Can comment on articles and discussions
Blanket, universal statements about transition are things Marxist and anarchist theorists are both guilty of, but I think where a lot of anti-authoritarian Marxists/post-Marxists and many anarchists can agree is that transition will be reflexive towards each unique situation. I also think it might warrant a new thread!