As long as you get a writer with a 4 star or more rating the work tends to be good. I have only had issues with one writer that I have hired and since have used the rule "as close to a 5 star rating as my budget allows." I really like the writer "Gracious" and the writer "classicwriter50".
My last assignment was titled "Rapid Industrial Development". This was an essay for US Modern History. I ended up with a B on the assignment.