Presumably amongst the 50 volumes of Marx/Engels Collected Works he was right in some places and wrong in others.

It's terribly vague and offers no insight as to which things Marx might have been right about. There's a child comment that's a bit better, but it dumps a lot of Wikipedia links out with little in the way of explanation.

In short, on HN it's better if you can explore ideas more thoroughly, rather than simply tossing out short quips and assuming everyone is on the same page.

It would be better to write something along the lines of 'When the article says __, this illustrates what Marx was talking about when he defined __ and that ties in with...' or such so there could be more discussion about ideas and less noise about voting or simple opinions.

He was in many respects. However, that offends delicate sensibilities here and so down goes da the vote.