Please share your opinions on this important topic so that we may discuss it until everyone has agreed on a singular viewpoint.
That's not the point of a discussion.
A discussion may not end with a singular viewpoint, but sometimes with even more questions and even more ways to look at things. What is more important is that people can be aware of others' opinions through discussions, and develop their arguments and ideas more thoroughly through discussions. Discussion itself is not a means to end discussion, but as a tool to exchange ideas, develop trained opinions, and to broaden one's view at a certain subject. If you wanted to 'discuss until everyone has agreed on a single viewpoint', then you only need a bandwagon. 'CAPITALISM IS GOOD, ANYONE THAT THINKS SO POST HERE. End of discussion.'
With that in mind, I'll be the devil's advocate.
Capitalism is not good, for several reasons. We must work slowly but without hesitation to change our system into a more efficient system.
One reason is that because it is good for us, does not intrinsically mean that a system may be 'good' in the longer run.
As one extremely ridiculous example, to survive, race A have to build a spaceship that uses up 87% of planet A's resources. Unfortunately, with race A's Capitalism's extremely wasteful resource usage race A have already used up 24% of Planet A's valuable resources and chucked them in the ocean. Unfortunately, to salvage the resources, race A has use more resources than they can salvage. And so, race A only awaits their extinction. While extreme, this does remind us of certain creatures on a planet called Earth. It only means that just because it's sweet right now, doesn't mean it's good. Aspartame is sweet, but if you eat too much of it, you go blind (course, you can't eat too much of it through commercial products).
Well there certainly are more reasons.
I don't believe that the system itself can be blamed for those who are "left out," that is rather the result of factors such as overpopulation, unchecked criminal behavior, and lack of motivation (usually passed down generations and ergo would benefit from temporary and significant outside involvment (both public and private) to kick whole communities out of detrimental cycles).
That's quite controversial. There are cases in which it is hard to tell if the system is creating underclass, or if the people themselves are drawn to be an underclass. Certainly, there can be cases in the latter, but you can't ignore the former either- because there are always both.
None.