Communism no doubt looked good on paper. A society where classes no longer exist and everyone is equal, I can see why so many fell for it.
However, what Karl Marx failed to take onto account was human nature and that is why his ideas were doomed from the start. You are always going to have power hungry maniacs out there, no matter what, and Communism was a perfect way for them to get into power. They said that capitalism was evil, that the rich had everything and the poor had nothing. Well, look at how the Communist bigwigs lived, in their nice big houses, driving fancy cars that they had shipped in from the West, a wazoo of servants. Stick these guys in a castle, and they would be right at home. They were the biggest hypocrites that ever walked this Earth.
Look at Nicolae and Elena Ceausescu of Romania, for example. They were essentially an Emperor and Empress, and they even had an Heir Apparent, their oldest son, Nico, waiting in the wings to take over. Of course, the 1989 revolution ended that, but you see what I mean.
And there is North Korea, which is now ruled by Kim Jong-Un, the third in the Kim Dynasty (Kim Il-Sung and Kim Jong-Il being his grandfather and father respectively). A whole religion has practically been built around these guys. From what I understand, the word "Communism" had now been deleted from the North Korean Constitution, so they're not even pretending anymore.
In short, while Communist countries claimed to have ended class warfare, that was, like everything else about Communism, a lie. The only thing that really changed were the names of those in charge.