Before I begin, I would like to say that I am not a collectivist. I have a very individualist ideology, in that I think a society which forces collectivization necessarily needs everyone to be on the same page. That is why there is often a tribal group dynamic in left wing organizations which is against free speech, and does not allow free, individualistic thought.
Now, that said, some of the basic problems of capitalism would be inequality, environmental destruction, and the inherent unsustainability of a system which must always expand for it to exist. That is aside from the inherently less enjoyable quality of the work place.
Inequality is present under capitalist systems where there is great wealth gathered at the top, while tens of thousands of people die because they don't have health care, millions are under student loan debt, and the first world exists because of the exploitation of the third world. To expound on the third world argument; the first world consumes many resources, so much so that it would require many planets for the third world to operate on the level of the third world. Yet, instead of sharing the wealth of these first world countries with the world, companies ship jobs over seas so they can pay lower wages.
This takes us to the problem of wages, and why the tendency of the rate of profit to fall will necessarily lead to the end of capitalism. In a world with finite resources, a system which must expand indefinitely, cannot grow indefinitely. Especially when faced with peak oil reserves, and global warming which threatens aggriculture, water supplies, and coastal areas. Capitalism, when it cannot grow anymore, will collapse, and we will need to adopt a sustainable system.
