Marx in Denial

Karl Marx was in a society of capitalism gone bad. He realized that there were major problems with the way things were, so he and Engels set out to figure out why and to fix these problems. While we agree that Marx was indeed insightful and had some great ideas, on the larger scale his conclusions were ultimately wrong. He thought that the class struggle would erupt, causing a workers revolution and the widespread institution of socialism.
Marx was disillusioned with the idea that if man would accept his form of government, all would work happily together for the good of the society. The heart surgeon would gladly receive the same pay as the cashier because ultimately the same amount of time goes into them. I know Marx was a smart guy, but even I have to question this belief. He obviously didn't know people very well and didn't realize that man is selfish and looks out for himself, not for one another. Perhaps Marx should have taken a step down from idealism and looked into the heart of man a bit closer.