Well, if you want to know opinion of his contemporaries you should read what they have written. Also, the third volume has a preface by Engels that tries to deflect criticism of contemporary economists.
> You should try reading Das Kapital.
Well, maybe you should try re-reading it, because as far as I understand it, it doesn’t say anything close to that; though I am sure there is an interpretation that claims so as there are dozens of various contradictory Marx’s interpretations.
He was.
>Das Kapital was just a bad book in terms of economic theory regardless of its anthropological value.
Das Kapital is a great book in both economic and anthropologic terms.
>Economists tended to discard Marx long before Lenin.
No they didn't.
>Hm. I am not sure I understand the connection.
You should try reading Das Kapital.