Marxists are big on democracy believe it or not. The idea that the proletariat has a viewpoint that isn't heard and can't be properly understood by the bourgeois is a call for representation. The "dictatorship" by most contemporary theorists isn't seen as of the Hussein variety but one of where the government is framed in order to help those people to provide the basis on which equality can develop. People aren't leveled out as the Tea Party would say. Everyone is provided the same basis, a strong basis on which to begin their life projects. Albeit the same origin it doesn't have to produce the same results for everyone.
As for political resistance, I think most Marxists see their stance as common-sensical. Who really thinks that exploitation is a beneficial thing? When the level of appearances is removed, people will see that where they put in forty hours of work their return is as if they had worked ten. Some would say that the owner of the company deserves that surplus profit but no one can give a reason beyond "because they say so" or "they had it first". Rousseau points to private property's origins as the person who put up a fence first and said this is mine. There is no reason to subscribe to this notion except for a respect for selfishness. Dissent doesn't need to be liquidated. That bullshit arises when dictators are challenged on both sides. A true Marxist state would have enough popular support if people understood what was truly going on that they would be able to support the policies that are occurring. There is no need for strong-arm tactics if mystification is removed.
As for the initial battle over the means of production, I would love to see the people be able to use the state to provide opportunities for small business. Usurp the vast means of production through minor networks of support. Just cut the giant at the knees kind of a thing. No need for violent revolution when you have solidarity. The La Cochabamba water riots were violent and it got the foreign parties removed from the country but the people still had to solve their own water issues once that happened. If the state could've protected them from repercussions, they could've undermined the foreign privatization through local networking.