Clearly he got some things right, and his theories provide a good account of why crises occur and the exploitative nature of wage labour. However, the idea of Marxism as "scientific" has drawn a lot of criticism - most notably from Karl Popper, who distinguishes theories like Marxism from science on the grounds that the former is unfalsifiable, but not everyone agrees with this claim. As stated, I am no expert and if I start making conclusions about Marxism's scientific credentials having read nothing more than the Communist Manifesto and half a volume of Capital then I'm going to start offending people (looking at you Dom Curran!).The essence of science is experiment and falsifiability, not grand philosophical theorizing. Grand theoretical thought has its place in science, but most often in order to design experiments, to create falsifiable hypotheses.
Libertarian socialism is a true "scientific" socialism, not in terms of its theoretical basis, but in its practice - by calling for spontaneous cooperation and organisation along with radical decentralisation, it allows myriad experiments - a practical science of social organisation. By overturning the sterile uniformity of the state, an anarchistic society could see areas alongside one another using different models of social and economic organisation - mutualism, syndicalism, communism.
Possibilities for experimentation abound: communal versus individualist settlements; highly automated industrial regions versus agrarian eco-communes and religious societies; decisions by consensus versus democratic voting versus networks of small, non-institutional affinity groups.
Without compulsory political communities people could choose the system, or non-system to live under, communities could learn from one another and the track records of different approaches could be looked at scientifically. A radical shift in society's social, economic or democratic organisations would no longer need us to wait for years to elect new representatives to decide how tens of millions of people are or are not allowed to live and cooperate. John Stuart Mill got something right when he talked about limiting government to allow "experiments in living" - the problem was that he didn't go far enough, failing to challenge property rights or the existence of a centralized territorial state.If you believe Marxists, there has never been a society "truly" organised on Marxist lines - the USSR and other "communist" societies are widely accepted to have been nothing of the sort. On the other hand, we have clear instances of libertarian-leftism in action - Maknovista Ukraine, anarchist Catalonia (read Dolgoff's The Anarchist Collectives), cooperative economic institutions, factory occupation and self-management movements, small Intentional Communities (communes), the student movements of 1968, Occupy Wall Street and so on. Thousands of written accounts exist documenting the successes and failures of these movements and institutions.
So, do you agree that libertarian socialism is the only true scientific socialism?

