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Social Democracy doesn't solve the fundamental problems with Capitalism, it just band-aids them. In the Nordics, these countries rely on Imperialism and usury through IMF loans to sustain themselves, and still see fundamental problems with Capitalism such as the Tendency for the Rate of Profit to Fall. Socialism does solve these problems.

As for whether or not Modes of Production have "worked," they generally have, but only within the context of their own development. Feudalism wasn't simply an idea we tried out, but a specific form of production that arose from real material conditions. Further, human greed isn't the problem either, rather certain systems express that to greater or lesser degrees.