The act of revolution is itself an authoritarian act. A bunch of people with guns force everyone else to listen to what they have to say. It was authoritarian when the American founding fathers did it, it was authoritarian when the French did it, it was authoritarian when the Russians did it.

What happens afterward is what counts. Every socialist society that has or currently exists has a democratic process, but capitalist countries point to the methods that various socialists have used to prevent capitalist takeover of their systems and say that those methods invalidate the whole process. Socialists, in turn, point to all of the rampant corruption that is taken for granted in capitalist elections and say that those make the process into a sham.

So the question is, do you believe that bourgeois control of mass media, political action groups, and the direct sponsorship of candidates by the wealthy invalidates capitalist elections? If so, to what extent do you think society should go to prevent those things from interfering in the democratic process? Whatever answer you come to, in order to implement it you will first need to get a bunch of people with guns together to dictate what the new democracy is going to look like.