Final answer:
Marxian/Radical theories have faced critiques for their failed economic predictions and unrealistic expectations of a global revolution. However, Marx's theory of social conflict leading to societal change is still relevant today.
Step-by-step explanation:
Marxian/Radical theories have faced several critiques throughout history. One major criticism is the failure of Marxist economic predictions. While Marx argued that the capitalist system would collapse and be replaced by socialism, many of his specific predictions did not come true in the expected time frame. Another critique is the idea that Marx's expectations of a global revolution and the rise of a classless society were unrealistic. Despite these critiques, Marx's ideas remain relevant today, particularly his theory of social conflict leading to societal change, which is widely used in modern sociology.