One thing about the Wal-Mart in Fort Dodge is that the woman who works there that I know had a darkroom herself once...she knows to keep the machines up well and I've never had bad results when SHE handled my film. I've had bad results when some of the student-types handled it, though, and now I try to go only when she's there or take my film elsewhere. The bad results happened *after* the images left the machines, though...as in some idgit, when sleeving the negatives, cut through the frame instead of through the area between frames. I was a bit pissed.
If the negatives are important to you, take them to a lab you can trust. I have the local Wal-Mart, but only because I know that at least one of the employees doesn't have her head up her you-know-where.
And if you want good prints, take the negatives to a pro lab. I have Wal-Mart give me a "contact sheet" with develop only. They're tiny, but they show if you've at least gotten things half right. 🙂