well, his did win the Nobel Prize for Literature in 1962.. "for his realistic and imaginative writings, combining as they do sympathetic humor and keen social perception". It is not necessarily easy reading, but he is regarded as having a brilliant mind and is certainly one of America's best-respected writers.
Steinbeck (1902-1968), hailed from California, and his novels are centred on the poor. He wrote about the economic difficulties of rural labor. They are detailed, tought and touching. His most famous was The Grapes of Wrath, which featured a group of Oklahoma farmers who failed to earn enough to live on, so they moved to California, where they became casual labourers.
There lots about him and other Nobel Prize-winning writers on:
http://www.literature-awards.com/the_nobel_prize.h
tm