Huh, I never knew Quaker Steak & Lube had spread that far. I lived in Sharon, PA for most of the 80s, and worked a couple blocks from the original restaurant. Decent wings, if a bit too focused on heat level ("atomic wings"). Nice lunch joint - of course, the pickings were pretty thin in Sharon.
I would submit that they actually aren't that good on an absolute scale. Relative to other widely available chain wings, perhaps, and I suspect that's why they have such a strong following.
Mind you, I haven't had them in years and now live almost 7 hours from the nearest Quaker Steak and Lube. My recollection may be flawed.