I'm truly sorry to hear about your bad experience, but mostly I'm sorry to hear about the slip (high speed crash?) in quality at Jim's. The two or three times I've been there it was outstanding. Huge, meaty ribs, tender, juicy brisket, and moist succulent pulled pork. Admittedly, I did not try the snout sandwich, and certainly will not now, for sure.
Sides varied for us. The beans were good, not great. The fries were an excellent, fresh cut version, and the slaw was good too; very fresh, rustic homemade style. Your bad review of the potato salad may have been the most troubling part of all. While the portion we were served was definitely on the sweet side, it was not cloying or overpowering of the other ingredients. In fact, what really impressed me was how the potato flavor stood out unlike so many other commercial varieties that rely more on the mayo than on the spud.
Tis a sad, sad day for the Quads if Jim's has allowed their quality to run into the ground like this.
Oh well, just one more excuse for avoiding I-80 through Iowa and taking I-55 to I-70 on our way to Kansas City. At least in Springfield I know I can get some good 'Que at The Dr. of BBQ.
Once again, my condolences.
Buddy