I don't really consider Saves The Day, "mall punk," but I can understand why someone would call them that. If anything they're kind of one of the founding fathers of "mall punk." Through Being Cool is such a fun album, and I have continued to listen to it over the years. I'm not exactly well versed in this genre either, but due to the fact that Saves The Day were around in the mid to late 90s, and that Through Being Cool came out in the late 90s (I think), I tend to give them a pass. They kind of played that genre before it was hip, and they did it really well.
Copper Blue is hands down my favorite Sugar album, but I clearly need to familiarize myself with File Under.