I know how you feel, but having a strong understanding of Marxian economics is fundamental to having a clear understanding of our problems as well as formulating rational solutions. It's not just right-wingers or liberals, even leftists from Socdems to Stalinists constantly have terrible opinions, ideas and solutions that could be cured just by having a scientific understanding of capitalism.

I recommend reading Value, Price and Profit. It's a very short lecture by Marx (just 3-4 pages) and it gives a basic outline of Marxist economics.