Actually, Costco does a good job. You just gotta know how to use the fact that they profile and make their ICC profiles available. Go to DryCreekPhoto and learn the steps necessary.
Thank you for your comments. I went to the DryCreekPhoto site and did some other on line searches. I went back to my Costco photo account to see what my default settings are. As it turns out I had the "do not auto correct" box checked. At some point I checked that box in my default profile. I believe that was a big mistake. I sent some new files over to Costco for comparison prints. I think I will now see the old Costco quality return. You are right, they do a pretty good job at least before I started having problems.
Thanks again - your post spurred me on to see why my results had gone from pretty good to not so great.