The first time I did door hangers was a great success. The next few times varied, but would get at least one new customer per neighborhood and most of those customers are now repeats.
You just gotta hit the right neighborhood.
I must also tell you that I included a magnet with the door hangers. Even if they canned the door hanger and coupon, those magnets stick, stuck, stook.
A weeks worth of door hangers, with MAGNETS is cheaper than a day of newspaper, and if targeted with a concise and correct design, will make you money.