The peasants did not go willingly.
The purpose of this period of working class rule is to eradicate the capitalist class and its ideology (not necessarily through violence, although in practice what ruling class yields to another without compulsion?), and develop the productive forces of the society in order to enable communism.
This last point is one of the big things that distinguishes Lenin's theories from Marx's, because Marx thought that revolution would naturally arise in the most advanced technological societies once the industrial base necessary for a transition to communism was already pretty much in place. As we know, the revolutions occurred in places with a lower level of development, thus requiring this theoretical modification and extending the period of rule by the working class beyond the brief duration that Marx envisaged.
The USSR, while it existed, always said they were "building socialism" and never said they had arrived at the destination, which is a classless society. The PRC says that it is "building socialism" and that the process might take a hundred generations. The purpose of their rule, according to their own theoretical framework, is to eventually give it up.
So no, Marxists are not "even more in favour of a ruling class above all."
I wonder how they're distributed among the various disciplines.
http://econlog.econlib.org/archives/2015/03/the_prevalence_1...
I gotta think they are more idealists than bona fide marxists though; I mean, if they read enough, they must know the drill (they wouldn’t have influence and any countertevolutionary ideas and they are sent off).