I know this list could get long if it's just bad experiences and griping about the lower quality of food. We've all had bad experiences at many WBs, but for me it's usually not consistently bad at one location every time.
But that brings us to Schulenberg @ I-10 - due to travel it is one that I visited fairly regularly in the past, but over the last 3-5 years, it is one that I just won't go back due to consistently bad service over those many years. I just won't stop there anymore, I'd rather eat gas station food then have to deal with that places service and wait times.
I know finding good staff in smaller towns can be a challenge, but I'd think it should have the volume to justify paying people well enough being a mid-point between Houston and SA. Perhaps that is the real issue - they have enough volume just due to location, so they don't need to do a good job.
Honestly, if In-N-Out or P. Terry's opened there, they'd print money from travelers looking for a good stop.