I'm really cheap and there aren't many things I'll pay extra for, but photo processing is one of them. I mean one of my son's friends got a job at Eckerd doing this when she was a teenager -- she was actually developing people's film on her first day. I take mine to a specialty camera store.
In my area, Wal Mart has the worst processing by far. My boss had some volutneer photos done there and I had them reprinted at Wolf Camera -- they should have used the before and after in ad there was so much difference. If the problem with your photos is in the developing, there is nothing that can be done. If it is in printing, however, the photos can be reprinted. Why don't you take one roll to Ritz Camera, Wolf Camera, your locally owned store, etc., and see whether anything can be done?