Any system i believe is akin to a weapon. It can be good or bad depending on whose hands it lies upon.

Capitalism as you've said, can be a good thing. But also it promotes greed and selfishness.

I suppose it ultimately relies on moderation, too much of any good thing makes it bad anyway.
Flaws are imminent, capitalism is just amongst the many systems that are not necessay to be followed right to the letter.