This faq list from the nybma is helpful, so is the input that Boots provided.
http://www.nybma.com/faq/faq_index.htm
As was alluded to, the companies who are constantly hiring more than likely fall into the "awful" category unless they are corporate behemoths like Breakaway.
which company is best??
http://www.nybma.com/faq/question4.htm
Tell your brother to make sure he's making $4 and up per delivery, at the very least.