I thought the polemic that Lenin II posted was pretty good.
But on the difference between a capitalist state and a socialist state, I think revisionism is when a country is on the capitalist road, and that societies like Cuba, China, North Korea, Vietnam, Venezuela are ruled by a bourgeoisie and just because they have a "socialist" label doesn't mean they're any closer to socialism (which requires the smashing of the bourgeois state and the foundation of a new state). we wouldn't start calling the u.s. under obama "almost a socialist state" due to nationalization of some banks/corporations and some social welfare programs...