"If you meet Marx on the road, kill Marx."

[limpyhobbler]

10. mostly no, some yes

Marx's description of the workings of capitalism is still the definitive text on the subject.

Primitive accumulation, class struggle, theory of surplus value, the trend toward monopoly, etc. are all needed concepts to describe our modern world.

In fact I'd say in our era of hyper-capitalism, Marx's ideas are more important and relevant than ever.

Not everything Marx ever wrote, but just in general.

On the other hand, we could be evolving into a neo-feudal society where the working class can be more accurately described as serfs or slaves than proletarians. If the fundamental class structure changes like that, Marx's ideas may lose some of their practical use. But his analytic method should still be valid.

The others (Lenin, etc.) I don't subscribe to in the first place, so I can't speak to that.