Perceived success is based on the expectation coming into the season, and that is no different in the land of the jackrabbit. If we expect the Jacks to make the playoffs and they don't, we certainly don't view the season as a success, but rather a disappointment (I hold off on calling a season a failure unless I can really find no positive effects on the program produced). It is also to be noted that each fan has different expectations for a season, hence the different post season perspectives.
As for us beating the Bison making the season a success, I think most Jacks fans would agree with me that beating you guys definitely makes the season better, but it certainly doesn't make it a success if the team doesn't meet our exceed our season expectations. For instance; if we went 1-10 with our only win being against the Bison, 99.9% of SDSU fans would NOT view that as a successful season, but it would be used as a defense mechanism if, for some reason, a Bison fan wanted to "remind" us of that season.