Capitalism sucks for the same reason Communism sucks. For the same reason Libertarianism would REALLY fucking suck.
Because people fucking suck.
People will always abuse the power they have to keep/accrue more of it.
Look at unions. Absolutely necessary for workers to unite and fight being taken advantage of by the companies who see them as nothing more than a number on a sheet. But then they can become the problem. (Look at the police unions for a perfect example.)
Religion. It was a great tool that helped raise civilization from small tribes. It created ethical mores that cemented the value of the individual. Then the ones that became powerful went on to become institutions of manipulation and control
There needs to be a balance and Communism is not it.
The original commenter is right. This is a stupid meme.